'Sworn' in the Bible

{Whenever} they went out, the hand of Yahweh was against them to harm [them], just as Yahweh warned, and just as Yahweh had sworn to them. And {they were very distressed}.

The men of Israel had sworn at Mizpah, saying, "None of us will give his daughter to Benjamin as a wife."

What will we do for them--for the [ones] being left over--for wives? For we have sworn by Yahweh not to give to them our daughters as wives."