Numbers 21:32-35 NIV

32 After Moses had sent spies1 to Jazer,2 the Israelites captured its surrounding settlements and drove out the Amorites who were there.
33 Then they turned and went up along the road toward Bashan3,4 and Og king of Bashan and his whole army marched out to meet them in battle at Edrei.5
34 The LORD said to Moses, "Do not be afraid of him, for I have handed him over to you, with his whole army and his land. Do to him what you did to Sihon king of the Amorites, who reigned in Heshbon.6"

References for Numbers 21:34

35 So they struck him down, together with his sons and his whole army, leaving them no survivors.7 And they took possession of his land.8

References for Numbers 21:35