Deuteronomy 2:26

22 just as He had done for the descendants of Esau who lived in Seir, when He destroyed the Horites from before them. They drove them out and have lived in their place to this day.

23 And the Avvim, who lived in villages as far as Gaza, were destroyed by the Caphtorites, who came out of Caphtor and settled in their place.)

24 “Arise, set out, and cross the Arnon Valley. See, I have delivered into your hand Sihon the Amorite, king of Heshbon, and his land. Begin to take possession of it and engage him in battle.

25 This very day I will begin to put the dread and fear of you upon all the nations under heaven. They will hear the reports of you and tremble in anguish because of you.”

26 So from the Wilderness of Kedemoth I sent messengers with an offer of peace to Sihon king of Heshbon, saying,

27 “Let us pass through your land; we will stay on the main road. We will not turn to the right or to the left.

28 You can sell us food to eat and water to drink in exchange for silver. Only let us pass through on foot,

29 just as the descendants of Esau who live in Seir and the Moabites who live in Ar did for us, until we cross the Jordan into the land that the LORD our God is giving us.”

30 But Sihon king of Heshbon would not let us pass through, for the LORD your God had made his spirit stubborn and his heart obstinate, that He might deliver him into your hand, as is the case this day.

Read all of Deuteronomy 2