Genesis 21:31-33

Amplified Bible

³¹ Therefore that place was called Beersheba (Well of the Oath or Well of the Seven), because there the two of them swore an oath. ³² So they made a covenant at Beersheba; then Abimelech and Phicol, the commander of his army, got up and returned to the land of the Philistines. ³³ Abraham planted a tamarisk tree at Beersheba, and there he called on the name of the Lord [in prayer], ^[a]the Eternal God.