Deuteronomy 2:27

24 Get up now, and go on your journey, crossing over the valley of the Arnon: see, I have given into your hands Sihon, the Amorite, king of Heshbon, and all his land: go forward to make it yours, and make war on him,

25 From now on I will put the fear of you in all peoples under heaven, who, hearing of you, will be shaking with fear and grief of heart because of you.

26 Then from the waste land of Kedemoth I sent representatives to Sihon, king of Heshbon, with words of peace, saying,

27 Let me go through your land: I will keep to the highway, not turning to the right or to the left;

28 Let me have food, at a price, for my needs, and water for drinking: only let me go through on foot;

29 As the children of Esau did for me in Seir and the Moabites in Ar; till I have gone over Jordan into the land which the Lord our God is giving us.

30 But Sihon, king of Heshbon, would not let us go through; for the Lord your God made his spirit hard and his heart strong, so that he might give him up into your hands as at this day.