Deuteronomy 31:4

4 The Lord will do to them as he did to Sihon and Og, the kings of the Amorites, and to 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 he said to them: "I am now one hundred twenty years old. I am no longer able to get about, and the Lord has told me, "You shall not cross over this Jordan.'

3 The Lord your God himself will cross over before you. He will destroy these nations before you, and you shall dispossess them. Joshua also will cross over before you, as the Lord promised.

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

5 The Lord will give them over to you and you shall deal with them in full accord with the command that I have given to you.

6 Be strong and bold; have no fear or dread of them, because it is the Lord your God who goes with you; he will not fail you or forsake you."