'Sworn' in the Bible

Whenever they marched out, the hand of the LORD was against them for evil, as the LORD had warned, and as the LORD had sworn to them; and they were in sore straits.

Now the men of Israel had sworn at Mizpah, "No one of us shall give his daughter in marriage to Benjamin."

What shall we do for wives for those who are left, since we have sworn by the LORD that we will not give them any of our daughters for wives?"

Yet we cannot give them wives of our daughters." For the people of Israel had sworn, "Cursed be he who gives a wife to Benjamin."