Deuteronomy 31:3-5

3But the Lord your God himself will cross over ahead of you. He will destroy the nations living there, and you will take possession of their land. Joshua will lead you across the river, just as the Lord promised.

4“The Lord will destroy the nations living in the land, just as he destroyed Sihon and Og, the kings of the Amorites.

5The Lord will hand over to you the people who live there, and you must deal with them as I have commanded you.