Deuteronomy 31:3-5

3As for the Lord your God, he is about to cross over before you; he will destroy these nations before you and dispossess them. As for Joshua, he is about to cross before you just as the Lord has said.

4The Lord will do to them just what he did to Sihon and Og, the Amorite kings, and to their land, which he destroyed.

5The Lord will deliver them over to you and you will do to them according to the whole commandment I have given you.