Deuteronomy 23:21

“Speak to the sons of Israel and say to them, ‘When a man makes a difficult vow, he shall be valued according to your valuation of persons belonging to Yahweh.

“If a man makes a vow to Yahweh or swears an oath to bind himself with a binding obligation, he shall not violate his word; he shall do according to all that proceeds out of his mouth.

So Jonathan cut a covenant with the house of David, saying, “May Yahweh require it at the hands of David’s enemies.”

“Offer to God a sacrifice of thanksgiving And pay your vows to the Most High;

“Again, you have heard that the ancients were told, ‘You shall not make false vows, but shall fulfill your vows to the Lord.’