Genesis 21:31–33

31 Therefore hthat place was called Beersheba,4 because there both of them swore an oath. 32 So they made a covenant at Beersheba. Then Abimelech and Phicol the commander of his army rose up and returned to the land of the Philistines. 33 Abraham planted a tamarisk tree in Beersheba and icalled there on the name of the Lord, jthe Everlasting God.