1 Samuel 20:14-17

20:14 While I am still alive, extend to me the loyalty of the Lord, or else I will die! 20:15 Don’t ever cut off your loyalty to my family, not even when the Lord has cut off every one of David’s enemies from the face of the earth 20:16 and called David’s enemies to account.” So Jonathan made a covenant with the house of David. 20:17 Jonathan once again took an oath with David, because he loved him. In fact Jonathan loved him as much as he did his own life.

Genesis 21:23

21:23 Now swear to me right here in God’s name that you will not deceive me, my children, or my descendants. Show me, and the land where you are staying, the same loyalty that I have shown you.”

Genesis 31:48

31:48 Laban said, “This pile of stones is a witness of our agreement today.” That is why it was called Galeed.

Genesis 31:53

31:53 May the God of Abraham and the god of Nahor, the gods of their father, judge between us.” Jacob took an oath by the God whom his father Isaac feared.

Hebrews 6:16

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