Genesis 21:29-31

Complete Jewish Bible

²⁹ Avimelekh asked Avraham, “What is the meaning of these seven female lambs you have put by themselves?” ³⁰ He answered, “You are to accept these seven female lambs from me as witness that I dug this well.” 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.