Deuteronomy 31:3-5

3The Lord your God Himself crosses over before you; He will destroy these nations from before you, and you shall dispossess them. Joshua himself crosses over before you, just as the Lord has said.

4And the Lord will do to them as He did to Sihon and Og, the kings of the Amorites and their land, when He destroyed them.

5The Lord will give them over to you, that you may do to them according to every commandment which I have commanded you.