Deuteronomy 31:21

And it shall come to pass, when many evils and troubles are befallen them, that this song shall testify against them as a witness; for it shall not be forgotten out of the mouths of their seed: for I know their imagination which they go about, even now, before I have brought them into the land which I sware.

EXPOSITORY (ENGLISH BIBLE)

Ellicott's Commentary for English Readers

(21) This song . . . shall not be forgotten out of the mouths of their seed.—And it is not forgotten now. St. Paul made special use of it in the last days of the second Temple. This song is a favourite piece of Hebrew poetry to this day. Rashi observes: “This is a promise to Israel that the law shall not be utterly forgotten by their seed.”

I know their imagination.—Heb., yêtzer, the same word employed in Genesis 6:5; Genesis 8:21. It is the word commonly used in Rabbinical literature for the evil nature or good nature in any man. The nature which they are forming, or making, this day, would be a literal rendering of the sentence in this verse. And yet with all this, He made Balaam say, “He hath not beheld iniquity in Jacob nor seen perverseness in Israel” (Numbers 23:21). Comp. 1Chronicles 28:9, “The Lord . . . understandeth all the imaginations of the thoughts,” and Psalm 103:14, “He knoweth our frame (yêtzer); He remembereth that we are dust.”

Benson Commentary

Deuteronomy 31:21. This song shall testify against them as a witness — That they were sufficiently admonished of their duty, and forewarned what would be the consequence of their defection from me and my worship, (Deuteronomy 32:18-19,) and be a clear evidence that the calamities which befall them are judgments sent from me for the punishment of their transgressions. How ought this to be remarked with wonder! For, to this very day, above three thousand years after, this song is a strong proof and demonstration, both to Jews and Christians, that Moses did indeed speak by the commandment of God. I know their imagination — Inclination to idolatry, which they do not check as they ought: and some of them do not only cherish it in their hearts, but, as far as they can and dare, secretly practise it, as may be gathered from Amos 5:25; Acts 7:43.

Matthew Henry's Concise Commentary

31:14-22 Moses and Joshua attended the Divine Majesty at the door of the tabernacle. Moses is told again that he must shortly die; even those who are most ready and willing to die, need to be often reminded of its coming. The Lord tells Moses, that, after his death, the covenant he had taken so much pains to make between Israel and their God, would certainly be broken. Israel would forsake Him; then God would forsake Israel. Justly does he cast those off who so unjustly cast him off. Moses is directed to deliver them a song, which should remain a standing testimony for God, as faithful to them in giving them warning, and against them, as persons false to themselves in not taking the warning. The word of God is a discerner of the thoughts and intents of men's hearts, and meets them by reproofs and correction. Ministers who preach the word, know not the imaginations of men; but God, whose word it is, knows perfectly.

Barnes' Notes on the Bible

A witness for me against them - i. e., an attestation from their own mouths at once of God's benefits, their own duties, and their deserts when they should fall away. Being in verse it would be the more easily learned and kept in memory. The use of songs for such didactic purposes was not unknown to the legislators of antiquity. Compare also the advice of Paul, "teaching and admonishing one another in psalms and hymns and spiritual songs" Colossians 3:16.

Jamieson-Fausset-Brown Bible Commentary

19. Now therefore write ye this song—National songs take deep hold of the memories and have a powerful influence in stirring the deepest feelings of a people. In accordance with this principle in human nature, a song was ordered to be composed by Moses, doubtless under divine inspiration, which was to be learnt by the Israelites themselves and to be taught to their children in every age, embodying the substance of the preceding addresses, and of a strain well suited to inspire the popular mind with a strong sense of God's favor to their nation.

Matthew Poole's Commentary

It shall not be forgotten: this seems not to be a precept that they should remember it, but a prediction, that God would give them sad occasion to remember it, by bringing upon them the dreadful calamities mentioned in it.

Their imagination which they go about, even now; either their inward inclinations to idolatry, which they do not check, as they ought, but rather entertain with delight; and some of them do not only cherish it in their hearts, but as far as they can and dare secretly practise it, as may be gathered from Amos 5:26 Acts 7:43; or their secret purposes to allow themselves therein, when they are settled in their land, which were clearly known to God, though it may be not fully evident to themselves.

Gill's Exposition of the Entire Bible

And it shall come to pass, when many evils and troubles are befallen them,.... As did in the times of the judges, in the Babylonish captivity, and do now in their present exile:

that this song shall testify against them as a witness; which so clearly points at their sins, with all their aggravated circumstances, and describes so fully their calamities, distresses, and punishment for them:

for it shall not be forgotten out of the mouths of their seed; which shows that it respects time to come, their later posterity, whose memory of this song would be conjured up by the evils that should come upon them for their sins; nor is it forgotten by them to this day, who acknowledge there are some things in it now fulfilled or fulfilling in them:

for I know their imagination which they go about even now: or are "making" (c); forming and framing within themselves, there being a secret inclination in their minds to idolatry, which were working and contriving schemes to bring it about, and set it up; and this, God, the searcher of hearts, knew full well, and that in process of time this evil imagination would break forth into act, in an open and flagrant manner:

before I have brought thee into the land which I sware; to their fathers, to give it to them for an inheritance, as is suggested in Deuteronomy 31:20.

(c) "faciens", Montanus; "quam facit", Pagninus.

Geneva Study Bible

And it shall come to pass, when many evils and troubles are befallen them, that this song shall {l} testify against them as a witness; for it shall not be forgotten out of the mouths of their seed: for I know their imagination which they go about, even now, before I have brought them into the land which I sware.

(l) That these evils are come upon them, because they have forsaken me.

EXEGETICAL (ORIGINAL LANGUAGES)

Cambridge Bible for Schools and Colleges

21. many evils … are come upon it] Cp. Deuteronomy 31:17; this song shall testify to its face, the same vb. as in Deuteronomy 19:18; as a witness, Deuteronomy 31:19; its seed; its imagination, yéṣer, lit. moulding. This term and its synonyms are applied in the O.T. to evil imaginations in rebellion against God (e.g. Genesis 6:5; Genesis 8:21, Psalm 10:2; Psalm 140:2, Proverbs 6:18, Lamentations 3:60 f.) except in two passages (1 Chronicles 28:9; 1 Chronicles 29:18), where they are used indifferently, and in Isaiah 26:3 where the yéṣer or imagination is described as stayed on God.

before I bring it into the land, etc.] See Deuteronomy 31:20.

Deuteronomy 31:21

Keil and Delitzsch Biblical Commentary on the Old Testament

"And now," sc., because what was announced in Deuteronomy 31:16-18 would take place, "write you this song." "This" refers to the song which follows in ch. 32. Moses and Joshua were to write the song, because they were both of them to strive to prevent the apostasy of the people; and Moses, as the author, was to teach it to the children of Israel, to make them learn it, that it might be a witness for the Lord (for Me) against the children of Israel. "This" is defined still further in Deuteronomy 31:20, Deuteronomy 31:21 : if Israel, through growing satisfied and fat in its land, which was so rich in costly good, should turn to other gods, and the Lord should visit it in consequence with grievous evils and troubles, the song was to answer before Israel as a witness; i.e., not only serve the Lord as a witness to the people that He had foretold all the evil consequences of apostasy, and had given Israel proper warning (Knobel), but to serve, as we may see from Deuteronomy 31:20, Deuteronomy 31:21, and from the contents of the song, as a witness, on the one hand, that the Lord had conferred upon the people so many benefits and bestowed upon them such abundant blessings of His grace, that apostasy from Him was the basest ingratitude, for which they would justly be punished; and, on the other hand, that the Lord had not rejected His people in spite of the punishments inflicted upon them, but would once more have compassion upon them and requite their foes, and thus would sanctify and glorify Himself as the only true God by His judgments upon Israel and the nations. The law, with its commandments, promises, and threats, was already a witness of this kind against Israel (cf. Deuteronomy 31:26); but just as in every other instance the appearance of a plurality of unanimous witnesses raises the matter into an indisputable truth, so the Lord would set up another witness against the Israelites besides the law, in the form of this song, which was adapted to give all the louder warning, "because the song would not be forgotten out of the mouths of their seed" (Deuteronomy 31:21). The song, when once it had passed into the mouths of the people, would not very readily vanish from their memory, but would be transmitted from generation to generation, and be heard from the mouths of their descendants, as a perpetual warning voice, as it would be used by Israel for God knew the invention of the people, i.e., the thoughts and purposes of their heart, which they cherished (עשׂה used to denote the doing of the heart, as in Isaiah 32:6) even then before He had brought them into Canaan. (On Deuteronomy 31:20, vid., Deuteronomy 7:5; Deuteronomy 9:5, and Exodus 3:8.) - In Deuteronomy 31:22 the result is anticipated, and the command of God is followed immediately by an account of its completion by Moses (just as in Exodus 12:50; Leviticus 16:34, etc.). - After this command with reference to the song, the Lord appointed Joshua to the office which he had been commanded to take, urging him at the same time to be courageous, and promising him His help in the conquest of Canaan. That the subject to ויצו is not Moses, but Jehovah, is evident partly from the words themselves, "I will be with thee' (vid., Exodus 3:12). (Note: Knobel's assertion (on Numbers 27:23) that the appointment of Joshua on the part of Moses by the imposition of hands, as described in that passage, is at variance with this verse, scarcely needs any refutation. Or is it really the case, that the installation of Joshua on the part of God is irreconcilable with his ordination by Moses?)