Deuteronomy 2:28 (KJV)

And I sent messengers out of the wilderness of Kedemoth unto Sihon king of Heshbon with words of peace, saying,

Let me pass through thy land: I will go along by the high way, I will neither turn unto the right hand nor to the left.

Thou shalt sell me meat for money, that I may eat; and give me water for money, that I may drink: only I will pass through on my feet;

(As the children of Esau which dwell in Seir, and the Moabites which dwell in Ar, did unto me;) until I shall pass over Jordan into the land which the Lord our God giveth us.

But Sihon king of Heshbon would not let us pass by him: for the Lord thy God hardened his spirit, and made his heart obstinate, that he might deliver him into thy hand, as appeareth this day.