Deuteronomy 31:4

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.

Deuteronomy 31:4 Meaning and Commentary

Deuteronomy 31:4

And the Lord shall do unto them as he did unto Sihon, and to
Og, kings of the Amorites
Deliver them up into their hands; see the history of this in ( Numbers 21:10-35 ) ;

and unto the land of them whom he destroyed;
put them into the possession of the land of Canaan, as they were now in possession of the land of those two kings he destroyed by them. This instance is given to encourage their faith, assuring them that what had been done to them would be done to the Canaanitish kings, and their subjects, and their lands.

Deuteronomy 31:4 In-Context

2 And he said to them: "I am one hundred and twenty years old today. I can no longer go out and come in. Also the Lord has said to me, 'You shall not cross over this Jordan.'

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.

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.

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

6 Be strong and of good courage, do not fear nor be afraid of them; for the Lord your God, He is the One who goes with you. He will not leave you nor forsake you."