Numbers 21:21-24

21And Israel sent messengers to Sihon king of the Amorites, saying,

22Let us pass through thy land; we will not turn into the fields, or into the vineyards; we will not drink water out of the wells; on the king's road will we go until we have passed thy border.

23But Sihon would not suffer Israel to go through his border; and Sihon gathered all his people, and went out against Israel into the wilderness, and came to Jahaz, and fought against Israel.

24And Israel smote him with the edge of the sword, and took possession of his land from the Arnon to the Jabbok, even unto the children of Ammon; for the border of the children of Ammon was strong.