Deuteronomy 31:19-22

“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. For when I bring them into the land flowing with milk and honey, which I swore to their fathers, and they have eaten and are satisfied and become prosperous, then they will turn to other gods and serve them, and spurn Me and break My covenant. Then it shall come about, when many evils and troubles have come upon them, that this song will testify before them as a witness (for it shall not be forgotten from the lips of their descendants); for I know their intent which they are developing today, before I have brought them into the land which I swore.” So Moses wrote this song the same day, and taught it to the sons of Israel.