The interpretation timeline
Zephaniah 3:9 Douay-Rheims

Because then I will restore to the people a chosen lip, that all may call upon the name of the Lord, and may serve him with one shoulder.

A.D. 407 – 1875 7 witnesses 8 excerpts

Patristic

before A.D. 750
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“Since this text did not literally refer to wild beasts, let the Jews say when this actually happened. For a wolf has never pastured a lamb. If it were to happen that they would pasture together, how would this benefit the human race? The text referred not to wild beasts but to wild people. It referred to Scythians, to Thracians, to Mauretanians, to Indians, to Sarmatians, to Persians. Another prophet made it clear that all these nations would be brought under one yoke when he said, "And they shall serve him under one yoke, and each one shall adore him from his own place." No longer, he said, will people worship him in Jerusalem but everywhere throughout the world. No longer are people bidden to go up to Jerusalem, but each one shall remain in his own home and offer this worship.”
Source
“Another prophet again made clear the way God would be worshiped. "They shall each adore him in his own place and serve him under one yoke." And again another prophet said, "The virgin of Israel had fallen. Never more shall she rise." And Daniel explained clearly that everything would be destroyed—the sacrifice, the libation, the anointing, the judgment.”
Source
604
A.D.
Gregory the Great Patristic
c. A.D. 540–604
“Because bodily action is carried on by the shoulder and the arm, if the good things which he put forth with the lips he did not fulfil in deed, he wishes to himself 'the shoulder to fall,' and 'the arm to be broken in pieces.' As though he said in plain words, 'If the things that I said I refused to do, this very member of my body, which was given to me for working withal, may I lose, that surely that may fall from the body which I would not exercise to advantage.' But if this sentence of a curse is to be referred to a spiritual meaning, it is doubtless plain that the arm is joined to the body by the shoulders, and as by the arm good practice, so by the shoulder the knitting together of social life, is denoted. Whence too the Prophet, regarding the holy peoples of the Church universal, that should serve God in concord, says, And they shall serve Him with one shoulder.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“For then will I turn to the people a pure language That is, at or about the time of the destruction of Jerusalem by the Romans; when the Jews, both in their own land, and in the Gentile world, would have the Gospel first preached to them, but would reject it; upon which the apostles and first ministers of the word would turn to the Gentiles, as the Lord commanded them; when he would turn or change his speech and language towards them, and their speech and language towards him would be turned and changed also: for the words may be taken either way; either of God's speech to the Gentiles, which is his Gospel sent unto them; as it was quickly after Christ's resurrection from the dead, and the rejection of it by the Jews; for many hundred years the Lord took no notice of them; winked at the times of their ignorance; sent no prophet to them, nor any message by anyone to instruct them; yea, he spake roughly to them, in a providential way; in the way of his judgments; particularly they raging and imagining vain things against his Messiah, he spake to them in his wrath, and vexed them in his sore displeasure; see ( Acts 17:30 ) ( Psalms 2:1 Psalms 2:5 ) but now he alters the tone of his voice, changes his language, and sends his Gospel to them; which is a "language" of love, grace, and mercy; of peace, pardon, righteousness, and salvation; encouraging souls to believe in Christ for those things: and this is a "pure" speech or language; a pure doctrine, fetched out of the sacred Scriptures; free from the dross of error; unmixed, consistent, and all of a piece; and which has a tendency to promote purity of heart, life, and conversation: or, is a "choice speech" F8; as some render it; it speaks of choice things, more valuable than gold and silver, pearls, and precious stones; the doctrines of it being an inestimable treasure, the unsearchable riches of Christ; and this, by the commission of Christ, upon his resurrection from the dead, was ordered to be spoke unto all nations, ( Matthew 28:19 ) ( Mark 16:15 ) or this may respect the different language spoken by the converted Gentiles, when the Gospel should come with power to them; who should speak, as all converted persons do, a different language than they spake before; instead of swearing and cursing, lying, filthy, and frothy speaking, now they speak the language of repentance towards God, confessing their sins, and praying for the pardon of them; the language of faith in Christ, first in a more weak and feeble manner, then with more strength and assurance, believing their interest in him, and in the everlasting love of God, and the covenant of grace; the language of love to Christ, his people, truths, and ordinances; a soul abasing, Christ exalting, and free grace magnifying language; the language of praise and gratitude for mercies received, temporal and spiritual; and especially for Christ, and grace and glory by him: they then speak the language of gracious experience to one another; and in the language of the Scriptures, in the taught words of the Holy Ghost; and, in common conversation, their language is pure, and free from that corruption and vitiosity it was before tainted with: this arises from pureness of heart; from a rich experience of the grace of God; from the teachings of the Spirit of God; and which betrays a man, and shows that he has been with Jesus; this is the language of Canaan, ( Isaiah 19:18 ) : that they may all call upon the name of the Lord; which sometimes takes in the whole worship and service of God; but, since that is later expressed, it rather intends, in particular, prayer to God; for which men are fitted and qualified, by having a pure language turned to them; or through the Gospel coming with power on them; and by virtue of efficacious grace converting them, and causing them to speak differently from what they did before; and then it is their voice is heard in prayer to God; and which is delightful and pleasant to him, ( Acts 9:11 ) ( Song of Solomon 2:14 ) and this is the case of "all" such that have this pure language; there is not a prayerless soul among them: it follows, to serve him with one consent; or, "with one shoulder" F9; the allusion is, either to bearers of burdens, that join together in carrying any burden, who put shoulder to shoulder as they carry it; or else to oxen drawing in a yoke, who are yoked together shoulder by shoulder; hence the Septuagint version renders it "under one yoke": in which it is followed by the Syriac and Arabic versions. The phrase signifies, that the Gentiles having the Gospel brought to them, and they called by it, and all speaking the same language, should join in fellowship with one another, and sing the praises of God together; agree in prayer to ask of God the same things; stand fast in the faith of the Gospel, and strive for it, being of the same mind; meet constantly together to carry on the several branches of religious worship, and promote the Redeemer's interest; all drawing the same way, like a company of horses in Pharaoh's chariots; having one heart, and one way given them to fear the Lord; and so, with one mind and one mouth, glorify God; so Kimchi and Ben Melech interpret it with one heart and one mind. This passage is applied to the times of the Messiah by the Jews, ancient and modern F11. FOOTNOTES: F8 (hrwrb hpv) "labium electum", Pagninus, Drusius. F9 (dxa Mkv) "humero uno", V. L. Montanus, Junius & Tremellius, Piscator, Cocceius. F11 Zohar in Gen. fol. 74. 1. Maimon. Hilchot Melachim, c. 11. sect. 5. Aben Ezra in Psal. cxlix. 7.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Will I turn to the people - This promise must refer to the conversion of the Jews under the Gospel. That they may all call - That the whole nation may invoke God by Christ, and serve him with one consent; not one unbeliever being found among them. The pure language, שפה ברורה saphah berurah, may here mean the form of religious worship. They had been before idolaters: now God promises to restore his pure worship among them. The word has certainly this meaning in Psa 81:6; where, as God is the speaker, the words should not be rendered, "I heard a language which I understood not," but, "I heard a religious confession, which I approved not." See Isa 19:18; Hos 14:3; and see Joe 2:28, where a similar promise is found.”
Source
1849
A.D.
1774–1849
“Chosen. Symmachus, “pure.” (Calmet) — Idols shall not be mentioned. (Theodoret) — All people shall know and adore the Lord, which was verified only after Christ’s coming. (Calmet) — Septuagint, “for then I will change again for the peoples, language to its own kind,” (Haydock) which Origen, (contra Cels. viii.) and the Jews in St. Jerome, explain of the days of the Messias, when the confusion of Babel shall cease. But this is forced: it suffices that people unite in faith and obey the Church. — Shoulder, like people carrying a burden. Septuagint, “under one yoke.” After the captivity the Jews were more obedient and faithful, as the more corrupt remained behind the Euphrates, or were cut off in the last wars. Yet the synagogue was never so pure as the Christian Church, even in the worst times. (Calmet) — All nations shall worship God in unity of faith, and courageously submit to the gospel. (Worthington)”
Source
1871
A.D.
1871
“For--The blessed things promised in this and Zep 3:10 are the immediate results of the punishment inflicted on the nations, mentioned in Zep 3:8 (compare Zep 3:19). turn to the people a pure language--that is, changing their impure language I will give to them again a pure language (literally, "lip"). Compare for this Hebrew idiom, Sa1 10:9, Margin. The confusion of languages was of the penalty sin, probably idolatry at Babel (Gen 11:1-6, Margin, where also "lip" expresses language, and perhaps also religion; Zep 3:4, "a tower whose top may reach unto heaven," or rather, points to heaven, namely, dedicated to the heavens idolized, or Bel); certainly, of rebellion against God's will. An earnest of the removal of this penalty was the gift of tongues on pentecost (Act 2:6-13). The full restoration of the earth's unity of language and of worship is yet future, and is connected with the restoration of the Jews, to be followed by the conversion of the world. Compare Isa 19:18; Zac 14:9; Rom 15:6, "with one mind and one mouth glorify God." The Gentiles' lips have been rendered impure through being the instruments of calling on idols and dishonoring God (compare Psa 16:4; Hos 2:17). Whether Hebrew shall be the one universal language or not, the God of the Hebrews shall be the one only object of worship. Until the Holy Ghost purify the lips, we cannot rightly call upon God (Isa 6:5-7). serve him with one consent--literally, "shoulder" or "back"; metaphor from a yoke, or burden, borne between two (Num 13:23); helping one another with conjoint effort. If one of the two bearers of a burden, laid on both conjointly, give way, the burden must fall to the earth [CALVIN]. Christ's rule is called a burden (Mat 11:30; Act 15:28; Rev 2:24; compare Co2 6:14 for the same image).”
Source
1875
A.D.
Keil & Delitzsch Lutheran
1861–1875
“"For then will I turn to the nations a pure lip, that they may all call upon the name of Jehovah, to serve Him with one shoulder. Zep 3:10. From beyond the rivers of Cush will they bring my worshippers, the daughter of my dispersed ones, as a meat-offering to me." By the explanatory kı̄ the promise is connected with the threat of judgment. The train of thought is this: the believers are to wait for the judgment, for it will bring them redemption. The first clause in Zep 3:9 is explained in different ways. Many commentators understand by sâphâh bherūrâh the lip of God, which He will turn to the nations through His holy servants. According to this view, Luther has adopted the rendering: "Then will I cause the nations to be preached to otherwise, with friendly lips, that they may all call upon the name of the Lord." But this view, which has been defended by Cocceius, Mark, and Hofmann (Schriftbeweis, ii. 2, pp. 573-4), would only be admissible if bruur signified clear, evident, - a meaning which Hofmann assumes as the ground of his explanation: "A clear, easily intelligible, unmistakeable language does God turn to the nations, to call them all in the name of Jehovah, that they may serve Him as one man." But, apart from the inadmissible rendering of קרא בשׁם יי, this explanation is proved to be erroneous by the fact that bârūr does not mean clear, intelligible; that even in Job 33:3 it has not this meaning; but that it simply means pure, purified, sinless; and that sâphâh bherūrâh, the opposite of טמא שׂפתים in Isa 6:5, cannot be used at all of the lip or language of God, but simply of the lip of a man who is defiled by sin. Consequently הפך אל must be explained according to Sa1 10:9, since the circumstance that we have הפך ל in this passage does not make any material difference in the meaning. The construction in both passages is a pregnant one. God turns to the nations a pure lip, by purifying their sinful lips, i.e., He converts them, that they may be able to call upon Him with pure lips. Lip does not stand for language, but is mentioned as the organ of speech, by which a man expresses the thoughts of his heart, so that purity of the lips involves or presupposes the purification of the heart. The lips are defiled by the names of the idols whom they have invoked (cf. Hos 2:19; Psa 16:4). The fruit of the purification is this, that henceforth they call upon the name of Jehovah, and serve Him. קרא בשׁם יי, when used of men, always signifies to call solemnly or heartily upon the name of Jehovah. To serve shekhem 'echâd, with one shoulder, is to serve together or with unanimity. The metaphor is taken from bearers who carry a burden with even shoulders; cf. Jer 32:39. As an example of the way in which they will serve the Lord, it is stated in Zep 3:10 that they will offer the widely scattered members of the Israelitish church as a sacrifice to the Lord. Compare Isa 66:20, where this thought is applied to the heathen of all quarters of the globe; whereas Zephaniah, while fixing his eye upon that passage, has given it more briefly, and taken the expression "from beyond the rivers of Cush" from Isa 18:1, for the purpose of naming the remotest heathen nations instar omnium. The rivers of Cush are the Nile and the Astaboras, with their different tributaries. עתרי בּת פּוּצי is the accusative of the nearest object, and מנחתי that of the more remote. ‛Athâr does not mean fragrance (Ges., Ewald, Maurer), but worshipper, from ‛âthar, to pray, to entreat. The worshippers are more precisely defined by bath pūtsai, the daughter of my dispersed ones (pūts, part. pass.), i.e., the crowd or congregation consisting of the dispersed of the Lord, the members of the Israelitish congregation of God scattered about in all the world. They are presented to the Lord by the converted Gentiles as minchâh, a meat-offering, i.e., according to Isa 66:20, just as the children of Israel offered a meat-offering. In the symbolism of religious worship, the presentation of the meat-offering shadowed forth diligence in good works as the fruit of justification. The meaning is therefore the following: The most remote of the heathen nations will prove that they are worshippers of Jehovah, by bringing to Him the scattered members of His nation, or by converting them to the living God. We have here in Old Testament form the thought expressed by the Apostle Paul in Romans 11, namely, that the Gentiles have been made partakers of salvation, that they may incite to emulation the Israelites who have fallen away from the call of divine grace. The words of the prophet treat of the blessing which will accrue, from the entrance of the Gentiles into the kingdom of God, to the Israelites who have been rejected on account of their guilt, and refer not only to the missionary work of Christians among the Jews in the stricter sense of the term, but to everything that is done, both directly and indirectly, through the rise and spread of Christianity among the nations, for the conversion of the Jews to the Saviour whom they once despised. Their complete fulfilment, however, will only take place after the pleroma of the Gentiles has come in, when the πώρωσις, which in part has happened to Israel, shall be removed, and "all Israel" shall be saved (Rom 11:25-26). On the other hand, Mark, Hitzig, and others, have taken ‛ăthârai bath pūtsai as the subject, and understand it as referring to the heathen who have escaped the judgment by flying in all directions to their own homes, for example even to Cush, and who having become converted, offer to the Lord the gift that is His due. But, apart from the parallel passage in Isa 66:20, which alone is quite decisive, this view is proved to be untenable by bath pūtsai, daughter of my dispersed ones. The thought that Jehovah disperses the heathen, either at the judgment or through the judgment, is foreign to the whole of the Old Testament, as Hitzig himself appears to have felt, when he changed pūts, to disperse, into its very opposite - namely, to come home. The thought, on the other hand, that God will disperse His people Israel among all nations on account of their sins, and will hereafter gather them together again, is a truth expressed even in the song of Moses, and one which recurs in all the prophets, so that every hearer or reader of our prophet must think at once of the Israel scattered abroad in connection with the expression "my (i.e., Jehovah's) dispersed ones." The objection, that Judah is first spoken of in Zep 3:11 (Hitzig), is thereby deprived of all its significance, even if this really were the case. But the objection is also incorrect, since the Judaeans have been already addressed in Zep 3:8 in the expression חכּוּ לי.”
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.