Deuteronomy 31:4

4 The Lord will do to them as he did to Sihon and to Og, the kings of the Amorites, and to their land, whom he put to destruction.

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 Then he said to them, I am now a hundred and twenty years old; I am no longer able to go out and come in: and the Lord has said to me, You are not to go over Jordan.

3 The Lord your God, he will go over before you; he will send destruction on all those nations, and you will take their land as your heritage: and Joshua will go over at your head as the Lord has said.

4 The Lord will do to them as he did to Sihon and to Og, the kings of the Amorites, and to their land, whom he put to destruction.

5 The Lord will give them up into your hands, and you are to do to them as I have given you orders.

6 Be strong and take heart, and have no fear of them: for it is the Lord your God who is going with you; he will not take away his help from you.