Numbers 21:24

21:24 But the Israelites defeated him in battle and took possession of his land from the Arnon to the Jabbok, as far as the Ammonites, for the border of the Ammonites was strongly defended.

Numbers 21:34

21:34 And the Lord said to Moses, “Do not fear him, for I have delivered him and all his people and his land into your hand. You will do to him what you did to King Sihon of the Amorites, who lived in Heshbon.

Deuteronomy 2:24-35

2:24 Get up, make your way across Wadi Arnon. Look! I have already delivered over to you Sihon the Amorite, king of Heshbon, and his land. Go ahead! Take it! Engage him in war! 2:25 This very day I will begin to fill all the people of the earth with dread and to terrify them when they hear about you. They will shiver and shake in anticipation of your approach.”

Defeat of Sihon, King of Heshbon

2:26 Then I sent messengers from the Kedemoth Desert to King Sihon of Heshbon with an offer of peace: 2:27 “Let me pass through your land; I will keep strictly to the roadway. I will not turn aside to the right or the left. 2:28 Sell me food for cash so that I can eat and sell me water to drink. Just allow me to go through on foot, 2:29 just as the descendants of Esau who live at Seir and the Moabites who live in Ar did for me, until I cross the Jordan to the land the Lord our God is giving us.” 2:30 But King Sihon of Heshbon was unwilling to allow us to pass near him because the Lord our God had made him obstinate and stubborn so that he might deliver him over to you this very day. 2:31 The Lord said to me, “Look! I have already begun to give over Sihon and his land to you. Start right now to take his land as your possession.” 2:32 When Sihon and all his troops emerged to encounter us in battle at Jahaz, 2:33 the Lord our God delivered him over to us and we struck him down, along with his sons and everyone else. 2:34 At that time we seized all his cities and put every one of them under divine judgment, including even the women and children; we left no survivors. 2:35 We kept only the livestock and plunder from the cities for ourselves.