Genesis 21:29–33

29 And Abimelech said to Abraham, “Why have you separated these seven ewe lambs?”

30 He replied, “You are to accept the seven ewe lambs from me so that this actA will serve as my witness that I dug this well.” 31 Therefore that place was called Beer-shebaB,k because it was there that the two of them swore an oath. 32 After they had made a covenant at Beer-sheba, Abimelech and Phicol, the commander of his army, left and returned to the land of the Philistines.

33 Abraham planted a tamarisk tree in Beer-sheba, and there he called on the name of the Lord, the Everlasting God.l