"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." Deuteronomy 31:19
"Give ear, O ye heavens, and I will speak; and hear O earth, the words of my mouth. My doctrine shall drop as the rain, my speech shall still as the dew, as the small rain upon the tender herb, and as the showers upon the grass: Because I will publish the name of the Lord: ascribe ye greatness unto our God." Deuteronomy 32:1-3
"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." Deuteronomy 31:21