Genesis 28:6-9

Esau knew that his father, Isaac, had blessed Jacob and sent him to Paddan-aram to find a wife, and that he had warned Jacob, “You must not marry a Canaanite woman.” He also knew that Jacob had obeyed his parents and gone to Paddan-aram. It was now very clear to Esau that his father did not like the local Canaanite women. So Esau visited his uncle Ishmael’s family and married one of Ishmael’s daughters, in addition to the wives he already had. His new wife’s name was Mahalath. She was the sister of Nebaioth and the daughter of Ishmael, Abraham’s son.