1 Samuel 28:10

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!”

1 Samuel 30:15

30:15 David said to him, “Can you take us down to this raiding party?” He said, “Swear to me by God that you will not kill me or hand me over to my master, and I will take you down to this raiding party.”

Hebrews 6:16

6:16 For people swear by something greater than themselves, and the oath serves as a confirmation to end all dispute.