Wherefore he called that place Beersheba; because there they sware both of them. He called that place Beer-sheba - באר שבע Beer-shaba, literally, the well of swearing or of the oath, because they both sware there - mutually confirmed the covenant.
Related Commentaries of Genesis 21:31
Genesis 21:31
31 Wherefore he called that place Beersheba;a because there they sware both of them.