Deuteronomy 31:4

4 The Lord will do to those nations what he did to Sihon and Og, the kings of the Amorites, when he destroyed them and their land.

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 "I am now one hundred twenty years old, and I cannot lead you anymore. The Lord told me I would not cross the Jordan River;

3 the Lord your God will lead you across himself. He will destroy those nations for you, and you will take over their land. Joshua will also lead you across, as the Lord has said.

4 The Lord will do to those nations what he did to Sihon and Og, the kings of the Amorites, when he destroyed them and their land.

5 The Lord will give those nations to you; do to them everything I told you.

6 Be strong and brave. Don't be afraid of them and don't be frightened, because the Lord your God will go with you. He will not leave you or forget you."