Genesis 21:31-33
31 Therefore he called that place (A)Beersheba, because there the two of them took an oath.
32 So they made a covenant at Beersheba; and Abimelech and Phicol, the commander of his army, arose and returned to the land of the Philistines.
33 Abraham planted a tamarisk tree at Beersheba, and there (B)he called on the name of the Lord, the (C)Everlasting God.