Hebrews 6:13

6:13 Now when God made his promise to Abraham, since he could swear by no one greater, he swore by himself,

Genesis 14:22

14:22 But Abram replied to the king of Sodom, “I raise my hand to the Lord, the Most High God, Creator of heaven and earth, and vow

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.”

Matthew 23:20-22

23:20 So whoever swears by the altar swears by it and by everything on it. 23:21 And whoever swears by the temple swears by it and the one who dwells in it. 23:22 And whoever swears by heaven swears by the throne of God and the one who sits on it.