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 21:31-32

21:31 That is why he named that place Beer Sheba, because the two of them swore an oath there.

21:32 So they made a treaty at Beer Sheba. Then Abimelech and Phicol, the commander of his army, returned to the land of the Philistines.