Now, therefore, write ye this song for you,.... Which was now dictated by the Lord, and given to Moses and Joshua to write, which is recorded in Deuteronomy 32:1,

continued...

"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?)

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.

Write ye this song - The song which follows in the next chapter. Things which were of great importance and of common concern were, among the ancients, put into verse, as this was found the best method of keeping them in remembrance, especially in those times when writing was little practiced. Even prose was sometimes sung. The history of Herodotus was divided into Nine books, and each inscribed with the name of one of the Nine Muses, because these books were anciently sung. Homer is reported to have sung his poems through different Greek cities. Aristotle observes that anciently the people sung their laws. And Cicero observes that it was a custom among the ancient Romans to sing the praises of their heroes at the public festivals. This was the case among the northern inhabitants of Europe, particularly in Ireland and Scotland; hence the Gaelic poetry of Ossian and others. See Dodd; and see the note on Exodus 15:1, where the subject is largely treated.

Now therefore write ye this {i} song for you, and teach it the children of Israel: put it in their mouths, that this song may be a witness for me against the children of Israel.

(i) To preserve you and your children from idolatry, by remembering God's benefits.

31:19 Write this song - Which is contained Deu 32:1 - 43, and is put into a song that it may be better learned, and more fixed in their minds and memories. Put it in their mouths - Cause them to learn it, and sing it one to another, to oblige them to more circumspection. A witness - Of my kindness in giving them so many blessings, of my patience in bearing so long with them, of my clemency in giving them such fair and plain warnings, and my justice in punishing such an incorrigible people.

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.

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