Genesis 26:31-33

26:31 Early in the morning the men made a treaty with each other. Isaac sent them off; they separated on good terms.

26:32 That day Isaac’s servants came and told him about the well they had dug. “We’ve found water,” they reported. 26:33 So he named it Shibah; that is why the name of the city has been Beer Sheba to this day.