30 And Jephthah vowed a vow unto Yahweh, and said,If thou wilt, deliver, the sons of Ammon into my hand,

31 then shall it be, that, whosoever cometh forth out of the doors of my house, to meet me, when I return successful, from the sons of Ammon, shall belong unto Yahweh, and I will offer him up, as an ascending-sacrifice.