Numbers 21:22-23

22“Permit us to pass through your land. We will not turn aside into field or vineyard nor drink water from the wells. We will travel on the king’s highway until we will have passed through your territory.”

23But Sihon would not let Israel pass through his territory. Instead, Sihon called out his entire army and marched out into the desert to oppose Israel. When he came to Jahaz, he fought against Israel.