The interpretation timeline
Deuteronomy 34:6 Douay-Rheims

And he buried him in the valley of the land of Moab over against Phogor: and no man hath known of his sepulchre until this present day.

A.D. 346 – 1871 5 witnesses

Patristic

before A.D. 750
346
A.D.
c. A.D. 270–346
“Two godly benefits did his Lord accomplish for Moses in not making known his tomb to the children of Israel. He rejoiced that his adversaries should not know it and cast forth his bones from his tomb; and in the second place, that the children of his people should not know it and make his tomb a place of worship, for he was accounted as God in the eyes of the children of his people.”
Source

Scholastic

c. 1100 – 1500
1105
A.D.
Rashi Jewish
1040–1105
ויקבר אותו AND HE BURIED HIM — i.e. The Holy One, blessed be He, in His glory, buried him (Sotah 14a). R. Ishmael, however, said, It means: “He buried himself”. This (the word אותו) is one of the three cases of את with a pronominal suffix which R. Ishmael explained thus (as being reflexive and not accusative pronouns). Similar to it is: (Numbers 6:13; see Rashi thereon) “On the day when his naziritehood is fulfilled, he shall bring אותו”, i.e. he shall bring (present) himself. Similar to it is, (Leviticus 22:16) “And they will burden אותם with iniquity of trespass”. But did others burden them (the priests) with that iniquity? But the meaning is that they burdened themselves (Sifrei Bamidbar 32). מול בית פעור OPPOSITE BETH PEOR — His grave was prepared there ever since the six days of Creation, to atone for the incident regarding Peor (see Numbers 25) (Sotah 14a). This (Moses' grave) was one of the things that were created “between the twilights” on the eve of the Sabbath [in the week of the Creation] (Pirkei Avot 5:6; Pesachim 54a).”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And he buried him,.... Aben Ezra says he buried himself, going into a cave on the top of the mount, where he expired, and so where he died his grave was; but though he died on the mount, he was buried in a valley: Jarchi and so other Jewish writers (d) say, the Lord buried him; it may be by the ministry of angels: an Arabic writer says (e), he was buried by angels: it is very probable he was buried by Michael, and who is no other than the archangel or head of principalities and powers, our Lord Jesus Christ, for a reason that will be hereafter suggested, see Jde 1:9, in a valley in the land of Moab, over against Bethpeor; where stood a temple dedicated to the idol Peor, see Deu 3:29, but no man knoweth of his sepulchre unto this day; to the time when Joshua wrote this, or, as others think, Samuel: if Moses is the same with the Osiris of the Egyptians, as some think (f), it may be observed, that his grave is said to be unknown to the Egyptians, as Diodorus Siculus (g) and Strabo (h) both affirm; and the grave of Moses is unknown, even unto this our day: for though no longer ago than in the year 1655, in the month of October, it was pretended to be found by some Maronite shepherds on Mount Nebo, with this inscription on it in Hebrew letters, "Moses the servant of the Lord"; but this story was confuted by Jecomas, a learned Jew, who proved it to be the grave of another Moses (i), whom Wagenseil conjectures was Moses Maimonides (k); but some think the whole story is an imposition: the reason why the grave of Moses was kept a secret was, as Ben Gersom suggests, lest, because of his miracles, succeeding generations should make a god of him and worship him, as it seems a sort of heretics called Melchisedecians did (l): the death and burial of Moses were an emblem of the weakness and insufficiency of the law of Moses, and the works of it, to bring any into the heavenly Canaan; and of the law being dead, and believers dead to that through the body of Christ, and of the entire abrogation and abolition of it by Christ, according to the will of God, as a covenant of works, as to the curse and condemnation of it, and justification by it; who is Michael the archangel, and is the end of the law for righteousness; he abolished it in his flesh, nailed it to his cross, carried it to his grave, and left it there; the rites and ceremonies of it are to be no more received, nor is it to be sought after for righteousness and life, being dead and buried, Rom 7:6. (d) Misn. Sotah, c. 1. sect. 9. Pirke Eliezer, c. 17. (e) Abulpharag. Hist. Dynast. p. 32. (f) See Gale's Court of the Gentiles, B. 2. c. 7. p. 94. (g) Bibliothec. l. 1. p. 18. (h) Geograph. l. 17. p. 552. (i) See Calmet's Dictionary, in voce "Sepulchre". (k) Not. in Sotah, p. 327. (l) Epiphan contr. Haeres. l. 2. Haeres. 55.”
Source
1849
A.D.
1774–1849
“He buried him, viz., by the ministry of angels, and would have the place of his burial to be unknown, lest the Israelites, who were so prone to idolatry, might worship him with divine honours. (Challoner) — St. Michael therefore contended with satan about his body, Jude 9. Some have maintained that Josue and Eleazar performed these last rites to their deceased lawgiver. (Calmet) — But then some men would have known where he was buried. (Haydock) — Day. It is pretended that Jeremias discovered the place, 2 Machabees ii. 4, 5. He found indeed a hollow cave….and so stopped the door. Yet this does not prove that he found the sepulchre of Moses, (Calmet) who was buried in some valley over-against Phogor, but it is not said in a cave. (Haydock) — Cajetan infers from the body of Moses not being buried in the mountain, that it was conveyed by angels to some vale, where his attendants could not see him.”
Source
1871
A.D.
1871
“he buried him--or, "he was buried in a valley," that is, a ravine or gorge of the Pisgah. Some think that he entered a cave and there died, being, according to an ancient tradition of Jews and Christians, buried by angels (Jde 1:9; Num 21:20). no man knoweth of his sepulchre unto this day--This concealment seems to have been owing to a special and wise arrangement of Providence, to prevent its being ranked among "holy places," and made the resort of superstitious pilgrims or idolatrous veneration, in after ages.”
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.