Charles Ellicott Commentary Deuteronomy 31:16

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

And break my covenant. —With this, contrast Judges 2:1: I said, I will never break my covenant with you. The phrases are identical in Hebrew. Compare to 2 Timothy 2:13: If we do not believe, yet He abides faithful: He cannot deny Himself.