The Song of Moses -- Part 2 of 6

(Deuteronomy 31:16) And the LORD said unto Moses, Behold, thou shalt sleep with thy fathers; and this people will rise up, and go a whoring after the gods of the strangers of the land, whither they go to be among them, and will forsake me, and break my covenant which I have made with them.

So the first thing, before they even got in the land, Moses was told, they are going to break my covenant, and then in verse 19,

(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.

This is the purpose of the song of Moses, that it's a witness against the children of Israel. Then Moses was also told, in verse 26,

(Deuteronomy 31:26) Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.

So God has his two witnesses against Israel, and we saw from the law, that two witnesses are necessary, for conviction of any sin that carries the death penalty.