Deuteronomy 31:2-4

Amplified Bible

² And he said to them, “I am ^[a]a hundred and twenty years old today; I am no longer able to come in and go out [as your spiritual and military leader], and the Lord has said to me, ‘You shall not cross this Jordan.’ ³ It is the Lord your God who will cross ahead of you; He will destroy these nations before you, and you shall dispossess them. Joshua is the one who will go across before you [to lead you], just as the Lord has said. ⁴ The Lord will do to them just as He did to Sihon and Og, the kings of the Amorites, and to their land, when He destroyed them.