Genesis 21:31 in the King James Version
Wherefore he called that place Beer-sheba; because there they sware both of them.
Context
30 He said, “You shall take these seven ewe lambs from my hand, that it may be a witness to me, that I have dug this well.”
31 Therefore he called that place Beersheba, because they both swore an oath there.
32 So they made a covenant at Beersheba. Abimelech rose up with Phicol, the captain of his army, and they returned into the land of the Philistines.