Deuteronomy 31:22

18I will surely hide my face in that day for all the evil which they have done, in that they have turned to other gods.

19“Now therefore write 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.

20For when I have brought them into the land which I swore to their fathers, flowing with milk and honey, and they have eaten and filled themselves, and grown fat, then they will turn to other gods, and serve them, and despise me, and break my covenant.

21It will happen, when many evils and troubles have come on them, that this song will testify before them as a witness; for it will not be forgotten out of the mouths of their descendants; for I know their ways and what they are doing today, before I have brought them into the land which I promised them.”

22So Moses wrote this song the same day, and taught it to the children of Israel.

23He commissioned Joshua the son of Nun, and said, “Be strong and courageous; for you shall bring the children of Israel into the land which I swore to them. I will be with you.”

24When Moses had finished writing the words of this law in a book, until they were finished,

25Moses commanded the Levites, who bore the ark of the LORD’s covenant, saying,

26“Take this book of the law, and put it by the side of the ark of the LORD your God’s covenant, that it may be there for a witness against you.