Genesis 21
31 Ref Therefore he called that place Beersheba,{Beersheba can mean "well of the oath" or "well of seven."} because they both swore there.
32 Ref So they made a covenant at Beersheba. Abimelech rose up with Phicol, the captain of his host, and they returned into the land of the Philistines.
33 Ref Abraham planted a tamarisk tree in Beersheba, and called there on the name of Yahweh, the Everlasting God.