Genesis 26:26-35

One day King Abimelech came from Gerar with his adviser, Ahuzzath, and also Phicol, his army commander. “Why have you come here?” Isaac asked. “You obviously hate me, since you kicked me off your land.” They replied, “We can plainly see that the LORD is with you. So we want to enter into a sworn treaty with you. Let’s make a covenant. Swear that you will not harm us, just as we have never troubled you. We have always treated you well, and we sent you away from us in peace. And now look how the LORD has blessed you!” So Isaac prepared a covenant feast to celebrate the treaty, and they ate and drank together. Early the next morning, they each took a solemn oath not to interfere with each other. Then Isaac sent them home again, and they left him in peace. That very day Isaac’s servants came and told him about a new well they had dug. “We’ve found water!” they exclaimed. So Isaac named the well Shibah (which means “oath”). And to this day the town that grew up there is called Beersheba (which means “well of the oath”). At the age of forty, Esau married two Hittite wives: Judith, the daughter of Beeri, and Basemath, the daughter of Elon. But Esau’s wives made life miserable for Isaac and Rebekah.