Genesis 28:6-9

Esau had learned that Isaac had blessed Jacob and had sent him away to Paddan-Aram to find a wife there, and that while blessing him, Isaac had instructed him, “Don’t marry a Canaanite woman.” Furthermore, Esau found out that Jacob had obeyed his parents and fled to Paddan-Aram. Esau, knowing that his father Isaac disapproved of Canaanite women, went to Ishmael’s clan and chose a woman named Mahalath to be one of his wives. She was the daughter of Ishmael, Abraham’s son, and sister of Nebaioth.