And 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.
Deuteronomy 31:4
Surrounding context
31:3 The 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.
31:4 And 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.
31:5 The LORD will give them over to you, that you may do to them according to every commandment which I have commanded you.