Deuteronomy 31:19, 21, 26

“Now therefore, write down this song for yourselves, and teach it to the children of Israel; put it in their mouths, that this song may be a witness for Me against the children of Israel.

Then it shall be, when many evils and troubles have come upon them, that this song will testify against them as a witness; for it will not be forgotten in the mouths of their descendants, for I know the inclination of their behavior today, even before I have brought them to the land of which I swore to give them.”

“Take this Book of the Law, and put it beside the ark of the covenant of the LORD your God, that it may be there as a witness against you