Numbers 21:22-23

22“Let us go through your country. We won’t go through any of your fields or vineyards or drink any of the water from your wells. We’ll stay on the king’s highway until we’ve passed through your territory.”

23Sihon wouldn’t let Israel pass through his territory. Sihon gathered all his troops and came out into the desert to attack Israel. When Sihon’s troops came to Jahaz, they fought against Israel.