Deuteronomy 31:1-3

King James Version

31 And Moses went and spake these words unto all Israel.

² And he said unto them, I am an hundred and twenty years old this day; I can no more go out and come in: also the Lord hath said unto me, Thou shalt not go over this Jordan.

³ The Lord thy God, he will go over before thee, and he will destroy these nations from before thee, and thou shalt possess them: and Joshua, he shall go over before thee, as the Lord hath said.