1 Samuel 28:9-10

28:9 But the woman said to him, “Look, you are aware of what Saul has done; he has removed the mediums and magicians from the land! Why are you trapping me so you can put me to death?” 28:10 But Saul swore an oath to her by the Lord, “As surely as the Lord lives, you will not incur guilt in this matter!”