Judges 11:9-11

So Jephthah said to the elders of Gilead, “If you take me back to fight against the sons of Ammon and the LORD gives them up to me, will I become your head?” The elders of Gilead said to Jephthah, “The LORD is witness between us; surely we will do as you have said.” Then Jephthah went with the elders of Gilead, and the people made him head and chief over them; and Jephthah spoke all his words before the LORD at Mizpah.