Genesis 21:31 KJV
Wherefore he called that place Beer–sheba; because there they sware both of them.
Genesis 21:31, King James Version
In context
30 And he said, For these seven ewe lambs shalt thou take of my hand, that they may be a witness unto me, that I have digged this well.
31 Wherefore he called that place Beer–sheba; because there they sware both of them.
32 Thus they made a covenant at Beer–sheba: then Abimelech rose up, and Phichol the chief captain of his host, and they returned into the land of the Philistines.