Judges 11:11-12

¹¹So Jephthah went with them back to the Gilead region, and the people appointed him to be their leader and the commander of their army. And Jephthah solemnly promised to Yahweh there at Mizpah to serve him well.

¹²Jephthah sent some messengers to the king of the Ammon people-group. They asked the king, “What have we done to make you angry, with the result that your army is coming to fight against the people in our land?”