But the king spared Mephibosheth, the son of Jonathan the son of Saul, because of the oath of Yahweh which was between them, between David and Saul’s son Jonathan.
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.
unless, when we come into the land, you tie this cord of scarlet thread in the window through which you let us down, and gather to yourself into the house your father and your mother and your brothers and all your father’s household.