1 Kings 1:51-52

51Solomon was told, “Look, Adonijah fears you; see, he has taken hold of the horns of the altar, saying, ‘May King Solomon solemnly promise me today that he will not kill his servant with the sword.’”

52Solomon said, “If he is a loyal subject, not a hair of his head will be harmed, but if he is found to be a traitor, he will die.”