Genesis 26:31-35

In the morning they got up early and exchanged oaths; then Isaac sent them away, and they left him in peace.

Now 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.”

So he called it Shibah; therefore the name of the city is Beersheba to this day.

When Esau was forty years old he married Judith the daughter of Beeri the Hittite, and Basemath the daughter of Elon the Hittite;

and they brought grief to Isaac and Rebekah.