Deuteronomy 31:19
Now therefore write ye this 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.
a. NASB 1995: “Now therefore, write this song for yourselves, and teach it to the sons of Israel; put it on their lips, so that this song may be a witness for Me against the sons of Israel. [New American Standard Bible 1995 (NASB1995) New American Standard Bible®, Copyright © 1960, 1971, 1977, 1995 by The Lockman Foundation. All rights reserved.]
b. YLT: 'And now, write for you this song, and teach it the sons of Israel; put it in their mouths, so that this song is to Me for a witness against the sons of Israel, [The Young's Literal Translation was translated by Robert Young, who believed in a strictly literal translation of God's word. This version of the Bible is in the public domain.]
c. Classic Amplified: And now write this song for yourselves and teach it to the Israelites; put it in their mouths, that this song may be a witness for Me against the Israelites. [Amplified Bible, Classic Edition (AMPC) Copyright © 1954, 1958, 1962, 1964, 1965, 1987 by The Lockman Foundation]
d. Stone Edition THE CHUMASH, Rabbinic Commentary: So now, write this song for yourselves, and teach it to the Children of Israel, place it in their mouth, so that this song shall be for Me a witness against the Children of israel. [The Artscroll Series/Stone Edition, THE CHUMASH Copyright 1998, 2000 by MESORAH PUBLICATIONS, Ldt.]
e. ESV: “Now therefore write this song and teach it to the people of Israel. Put it in their mouths, that this song may be a witness for me against the people of Israel. [Scripture quotations are from the Holy Bible, English Standard Version, copyright © 2001, 2007, 2011, 2016 by Crossway Bibles, a division of Good News Publishers. Used by permission. All rights reserved.]
f. Unless otherwise stated, all Greek and Hebrew definitions are from Blue Letter Bible
1. “Now therefore write ye this song for you, and teach it the children of Israel:
a. [Now] therefore [Strong: 6258 ʻattâh, at-taw'; from H6256; at this time, whether adverb, conjunction or expletive:—henceforth, now, straightway, this time, whereas.]
b. write [ye] [Strong: 3789 kâthab, kaw-thab'; a primitive root; to grave, by implication, to write (describe, inscribe, prescribe, subscribe):—describe, record, prescribe, subscribe, write(-ing, -ten).]
c. this [Strong: 2063 zôʼth, zothe'; irregular feminine of H2088; this (often used adverb):—hereby (-in, -with), it, likewise, the one (other, same), she, so (much), such (deed), that, therefore, these, this (thing), thus.]
d. [Strong: 853 'eth ayth apparent contracted from 226 in the demonstrative sense of entity; properly, self (but generally used to point out more definitely the object of a verb or preposition, even or namely):--(as such unrepresented in English).]
e. song [for you] [Strong: 7892 shîyr, sheer; or feminine שִׁירָה shîyrâh; from H7891; a song; abstractly, singing:—musical(-ick), × sing(-er, -ing), song.]
f. [and] teach it [Strong: 3825 lâmad, law-mad'; a primitive root; properly, to goad, i.e. (by implication) to teach (the rod being an Oriental incentive):—(un-) accustomed, × diligently, expert, instruct, learn, skilful, teach(-er, -ing).]
g. [Strong: 853 'eth ayth apparent contracted from 226 in the demonstrative sense of entity; properly, self (but generally used to point out more definitely the object of a verb or preposition, even or namely):--(as such unrepresented in English).]
h. [the] children [Strong: 1121 bên, bane; from H1129; a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc., (like father or brother), etc.):—afflicted, age, (Ahoh-) (Ammon-) (Hachmon-) (Lev-) ite, (anoint-) ed one, appointed to, (+) arrow, (Assyr-) (Babylon-) (Egypt-) (Grec-) ian, one born, bough, branch, breed, + (young) bullock, + (young) calf, × came up in, child, colt, × common, × corn, daughter, × of first, firstborn, foal, + very fruitful, + postage, × in, + kid, + lamb, (+) man, meet, + mighty, + nephew, old, (+) people, rebel, + robber, × servant born, × soldier, son, + spark, steward, + stranger, × surely, them of, + tumultuous one, valiant(-est), whelp, worthy, young (one), youth.]
i. [of] Israel [Strong: 3478 Yisrâʼêl, yis-raw-ale'; from H8280 and H410; he will rule as God; Jisraël, a symbolical name of Jacob; also (typically) of his posterity:—Israel.]
2. “...put it in their mouths, that this song may be a witness for me against the children of Israel.”
a. put it [Strong: 7760 sûwm, soom; or שִׂים sîym; a primitive root; to put (used in a great variety of applications, literal, figurative, inferentially, and elliptically):—× any wise, appoint, bring, call (a name), care, cast in, change, charge, commit, consider, convey, determine, disguise, dispose, do, get, give, heap up, hold, impute, lay (down, up), leave, look, make (out), mark, name, × on, ordain, order, paint, place, preserve, purpose, put (on), regard, rehearse, reward, (cause to) set (on, up), shew, stedfastly, take, × tell, tread down, (over-)turn, × wholly, work.]
b. [in their] mouths [Strong: 6310 peh, peh; from H6284; the mouth (as the means of blowing), whether literal or figurative (particularly speech); specifically edge, portion or side; adverbially (with preposition) according to:—accord(-ing as, -ing to), after, appointment, assent, collar, command(-ment), × eat, edge, end, entry, file, hole, × in, mind, mouth, part, portion, × (should) say(-ing), sentence, skirt, sound, speech, × spoken, talk, tenor, × to, two-edged, wish, word.]
c. that [Strong: 4616 maʻan, mah'-an; from H6030; properly, heed, i.e. purpose; used only adverbially, on account of (as a motive or an aim), teleologically, in order that:—because of, to the end (intent) that, for (to, ... 's sake), + lest, that, to.]
d. this [Strong: 2063 zôʼth, zothe'; irregular feminine of H2088; this (often used adverb):—hereby (-in, -with), it, likewise, the one (other, same), she, so (much), such (deed), that, therefore, these, this (thing), thus.]
e. song [for you] [Strong: 7892 shîyr, sheer; or feminine שִׁירָה shîyrâh; from H7891; a song; abstractly, singing:—musical(-ick), × sing(-er, -ing), song.]
f. [may] be [Strong: 1961 hâyâh, haw-yaw; a primitive root (compare H1933); to exist, i.e. be or become, come to pass (always emphatic, and not a mere copula or auxiliary):—beacon, × altogether, be(-come), accomplished, committed, like), break, cause, come (to pass), do, faint, fall, follow, happen, × have, last, pertain, quit (one-) self, require, × use.]
g. [a] witness [for me] [Strong: 5707 ʻêd, ayd; contracted from H5749; concretely, a witness; abstractly, testimony; specifically, a recorder, i.e. prince:—witness.]
h. [against the] children [Strong: 1121 bên, bane; from H1129; a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc., (like father or brother), etc.):—afflicted, age, (Ahoh-) (Ammon-) (Hachmon-) (Lev-) ite, (anoint-) ed one, appointed to, (+) arrow, (Assyr-) (Babylon-) (Egypt-) (Grec-) ian, one born, bough, branch, breed, + (young) bullock, + (young) calf, × came up in, child, colt, × common, × corn, daughter, × of first, firstborn, foal, + very fruitful, + postage, × in, + kid, + lamb, (+) man, meet, + mighty, + nephew, old, (+) people, rebel, + robber, × servant born, × soldier, son, + spark, steward, + stranger, × surely, them of, + tumultuous one, valiant(-est), whelp, worthy, young (one), youth.]
g. [of] Israel [Strong: 3478 Yisrâʼêl, yis-raw-ale'; from H8280 and H410; he will rule as God; Jisraël, a symbolical name of Jacob; also (typically) of his posterity:—Israel.]
1). It is believed that moses wrote three songs in Scripture.
a). Exodus 15:1-19
b). Deuteronomy 32:1-52
c). Psalm 90.