Judges 11:9-11

Jephthah said to them, “Very well. If you take me back home to fight the Ammonites and YAHWEH gives me victory, then you will make me your ruler. Agreed?” “That’s right,” they replied. “With YAHWEH as our witness, we pledge our loyalty to you.” So Jephthah returned home with the leaders of Gilead, and the people made him their commander and ruler. Jephthah stated his terms in a solemn ceremony at Mizpah in the presence of YAHWEH.