2 And Jehovah said unto me, Fear him not; for I have delivered him, and all his people, and his land, into thy hand; and thou shalt do unto him as thou didst unto Sihon king of the Amorites, who dwelt at Heshbon.

Matthew Henry's Commentary on Deuteronomy 3:2

Commentary on Deuteronomy 3:1-11

(Read Deuteronomy 3:1-11)

1-11 Og was very powerful, but he did not take warning by the ruin of Sihon, and desire conditions of peace. He trusted his own strength, and so was hardened to his destruction. Those not awakened by the judgments of God on others, ripen for the like judgments on themselves.