Deuteronomy 31:4

4 The LORD will do to these enemies the same thing he did to the Amorite kings Sihon and Og, 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 telling them: I'm 120 years old today. I can't move around well anymore. Plus, the LORD told me "You won't cross the Jordan River."

3 But the LORD your God, he's the one who will cross over before you! He's the one who will destroy these nations before you so you can displace them. Joshua too will cross over before you just like the LORD indicated.

4 The LORD will do to these enemies the same thing he did to the Amorite kings Sihon and Og, and to their land, when he destroyed them.

5 The LORD will lay them out before you, and you will do to them exactly what the command I've given you dictates.

6 Be strong! Be fearless! Don't be afraid and don't be scared by your enemies, because the LORD your God is the one who marches with you. He won't let you down, and he won't abandon you.