then it shall be, that whatever comes forth from the doors of my house to meet me, when I return in peace from the children of Ammon, it shall be Yahweh's, and I will offer it up for a burnt offering.
Webb pointed out, in the helpful article quoted above, that Israel had done the same thing Jephthah did. This tendency to negotiate with God marked and marred her relationship with Yahweh during this period of her history.