Numbers 21:21-23

21And Israel sent messengers unto Sihon king of the Amorites, saying, 22Let me pass through thy land: we will not turn into the fields, or into the vineyards; we will not drink of the waters of the well: but we will go along by the king’s high way, until we be past thy borders. 23And Sihon would not suffer Israel to pass through his border: but Sihon gathered all his people together, and went out against Israel into the wilderness: and he came to Jahaz, and fought against Israel.