Genesis 26:31-33

31In the morning they arose early and 12exchanged oaths; then Isaac sent them away and they departed from him in peace. 32Now it came about on the same day, that Isaac’s servants came in and told him about the well which they had dug, and said to him, “We have found water.” 33So he called it Shibah; therefore the name of the city is 3Beersheba to this day.