The interpretation timeline
Joel 2:29 Douay-Rheims

Moreover upon my servants and handmaids in those days I will pour forth my spirit.

A.D. 165 – 1871 12 witnesses 14 excerpts

Patristic

before A.D. 750
165
A.D.
Justin Martyr Patristic
A.D. 100–165
“I have already said, and do again say, that it had been prophesied that this would be done by Him after His ascension to heaven. It is accordingly said, 'He ascended on high, He led captivity captive, He gave gifts unto the sons of men.' And again, in another prophecy it is said: 'And it shall come to pass after this, I will pour out My Spirit on all flesh, and on My servants, and on My handmaids, and they shall prophesy.'”
Source
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“You hold to the Scriptures in which the flesh is disparaged; receive also those in which it is ennobled. You read whatever passage abases it. Now direct your eyes also to that which elevates it. "All flesh is grass." Well, but Isaiah was not content to say only this; he also declared, "All flesh shall see the salvation of God." Then notice what God says in Genesis: "My spirit shall not remain among these men, because they are flesh"; but then he is also heard saying by Joel, "I will pour out of my Spirit upon all flesh." Even the apostle ought not to be known for any one statement in which he is inclined to reproach the flesh. Admittedly he says that "in his flesh dwells no good thing" and "they who are in the flesh cannot please God," because "the flesh lusts against the Spirit." Yet in these and similar assertions that he makes, it is not the substance of the flesh, but its actions, which are censured. Moreover, we shall elsewhere take occasion to remark that no reproaches can fairly be cast upon the flesh without tending also to the castigation of the soul, which compels the flesh to do its bidding. However, let me meanwhile add that in the same passage Paul "carries about in his body the marks of the Lord Jesus." He also forbids our body to be profaned, since it is "the temple of God." He makes our bodies "the members of Christ." And he exhorts us to exalt and "glorify God in our body." If, therefore, the humiliations of the flesh do not prevent its resurrection, why wouldn't its high prerogatives avail to bringing it about? It better suits the character of God to restore to salvation what for a while he rejected, than to surrender to perditions what he once approved.”
Source
“We declare, then, that dreams are inflicted on us mainly by demons, although they sometimes turn out true and favorable to us. When, however, with the deliberate aim after evil, of which we have just spoken, they assume a flattering and captivating style, they show themselves proportionately vain, and deceitful, and obscure, and wanton, and impure. And no wonder that the images partake of the character of the realities. But from God—who has promised, indeed, "to pour out the grace of the Holy Spirit upon all flesh, and has ordained that his servants and his handmaids should see visions as well as utter prophecies"—must all those visions be regarded as emanating. [Those visions] may be compared with the actual grace of God, as being honest, holy, prophetic, inspired, instructive, inviting to virtue, the bountiful nature of which causes them to overflow even to the profane, since God, with grand impartiality, "sends his showers and sunshine on the just and on the unjust."”
Source
258
A.D.
Novatian Patristic
c. A.D. 220–258
“Next, well-ordered reason and the authority of our faith bid us (in the words and the writings of our Lord set down in orderly fashion) to believe, after these things, also in the Holy Spirit, who was in the times past promised to the church and duly bestowed at the appointed, favorable moment. He was promised by the prophet Joel but bestowed through Christ. "In the last days," says the prophet, "I will pour out from my spirit upon my servants and handmaids." And the Lord himself said, "Receive the Holy Spirit. If you forgive the sins of any, they are forgiven; if you retain the sins of any, they are retained."”
Source
date
unknown
c. A.D. 380
“Since, therefore, he has forsaken his people, he has also left his temple desolate, and rent the veil of the temple, and took from them the Holy Spirit, for says he, "Behold, your house is left unto you desolate." And he has bestowed upon you, the converted of the Gentiles, spiritual grace, as he says by Joel: " 'And it shall come to pass after these things,' says God, 'that I will pour out of my Spirit upon all flesh; and your sons shall prophesy, and your daughters shall see visions, and your old men shall dream dreams.' " For God has taken away all the power and efficacy of his Word and such like visitations from that people, and he has transferred it to you, the converted of the Gentiles. For on this account the devil himself is very angry with the holy church of God. He is removed to you and has raised against you adversities, seditions, and reproaches, schisms and heresies.”
Source
386
A.D.
Cyril of Jerusalem Patristic
A.D. 313–386
“And if you would receive a testimony also, "listen," he says. "But this is that which was spoken by the prophet Joel: 'And it shall come to pass after this, says God, I will pour forth of my Spirit' "—and this word, 'I will pour forth,' implied a rich gift; 'for God gives not the Spirit by measure for the Father loves the Son, and has given all things into his hand'; and he has given him the power also of bestowing the grace of the all-holy Spirit on whomever he will—"I will pour forth of my Spirit upon all flesh, and your sons and your daughters shall prophesy;" and afterward, "Yea, and on my servants and on my handmaidens I will pour out in those days of my Spirit, and they shall prophesy." The Holy Spirit is no respecter of persons, for he seeks not dignities but piety of soul. Let neither the rich be puffed up nor the poor be dejected, but only let each prepare himself for reception of the heavenly gift.”
Source
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“But of what creature can it be said that it fills all things, as is written of the Holy Spirit: "I will pour My Spirit upon all flesh." This cannot be said of an Angel. Lastly, Gabriel himself, when sent to Mary, said: "Hail, full of grace," plainly declaring the grace of the Spirit which was in her, because the Holy Spirit had come upon her, and she was about to have her womb full of grace with the heavenly Word.”
Source
“But that the Spirit is the Arbiter of the Divine Counsel, you may know even from this. For when above we showed that the Holy Spirit was the Lord of baptism, and read that baptism is the counsel of God, as you read, "But the Pharisees despised the counsel of God, not being baptized of Him," it is quite clear that as there can be no baptism without the Spirit, so, too, the counsel of God is not without the Spirit. And that we may know more completely that the Spirit is Power, we ought to know that He was promised when the Lord said: "I will pour out of My Spirit upon all flesh." He, then, Who was promised to us is Himself Power, as in the Gospel the same Son of God declared when He said: "And I will send the promise of the Father upon you, but do you remain in the city until ye be endued with power from on high."”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“On unessential points one must not spend many words. And besides, the sequel is enough to bear him out on this point, so now the discourse is for all in common. " 'But this is that which was spoken by the prophet Joel, and it shall come to pass in the last days,' says the Lord God." Nowhere as yet the name of Christ or his promise, but the promise is that of the Father.”
Source
date
unknown
c. A.D. 550
“This is Joel the second in order who was privileged to prophesy concerning the mystery of the Lord Christ, for he speaks thus (chap. ii, 28-32): And it shall come to pass afterward that I will pour out my spirit upon all flesh; and your sons and your daughters shall prophesy, your old men shall dream dreams, your young men shall see visions; and also upon the servants and upon the handmaids in those days will I pour out my spirit. And I will show wonders in the heavens and in the earth, blood and fire, and pillars of smoke. The sun shall be turned into darkness, and the moon into blood, before the great and terrible day of the Lord come. And it shall come to pass that whosoever shall call on the name of the Lord shall be delivered—a passage which the blessed Peter mentions in the Acts of the Apostles as having been fulfilled when the descent of the Holy Spirit upon the Apostles occurred on the day of Pentecost.”
Source

Medieval

c. 750 – 1100
850
A.D.
Ishodad of Merv Medieval
d. A.D. 850
“"I will pour out my spirit on all flesh." In the first instance he talks about Ezekiel, Daniel, Haggai, Zechariah and other prophets whose names are not mentioned. In addition, "your daughters" will sing and intone psalms in happiness, as well as the rest of the people. This means I will openly reveal to you my fondness and will largely pour it onto you. Therefore these words follow: "My Spirit abides among you," and also, "My spirit shall not abide in man forever, for he is flesh." But the truth of these words is found in Christ and in the apostles, as well as in the prophets and in the righteous ones, who were filled with the Spirit, and in the daughters of Philip. Recall Peter, who testifies when he preaches to the Jews: "This is," he says, "what Joel predicted." Then the words: "The sun shall be turned to darkness and the moon to blood." He talks according to the state of mind of those who are plunged into their afflictions.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And also upon the servants and upon the handmaids in those days will I pour my Spirit. Men servants and maidservants should partake of the gifts and grace of the Spirit in great, abundance; and many of them were effectually called by grace, through the ministry of the word; and some servants became ministers of it; all which appears from Co1 7:21; for that is not true what the Jews (p) say, the Shechinah or divine Majesty does not rest but upon a wise man, and one mighty and rich; or prophecy, as Maimonides (q) has it. (p) T. Bab. Sabbat, fol. 92. 1. (q) Moreh Nevochim, par. 2. c. 32.”
Source
1849
A.D.
1774–1849
“Handmaids. Septuagint of St. Jerome and St. Peter read, my handmaids. “My,” is omitted in both places in Complutensian and Hebrew and the latter word in the Roman Septuagint.”
1871
A.D.
1871
“And also--"And even." The very slaves by becoming the Lord's servants are His freemen (Co1 7:22; Gal 3:28; Col 3:11; Plm 1:16). Therefore, in Act 2:18 it is quoted, "My servants" and "My handmaidens"; as it is only by becoming the Lord's servants they are spiritually free, and partake of the same spirit as the other members of the Church.”
Source
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.