Genesis 21:31-33

Complete Jewish Bible

³¹ This is why that place was called Be’er-Sheva [well of seven, well of an oath] — because they both swore an oath there. ³² When they made the covenant at Be’er-Sheva, Avimelekh departed with Pikhol the commander of his army and returned to the land of the P’lishtim. ³³ Avraham planted a tamarisk tree in Be’er-Sheva, and there he called on the name of Adonai, the everlasting God.