Genesis 28:6-9

So when Esau saw that Isaac had given Jacob his blessing, and sent him away to Paddan-aram to get a wife for himself there, blessing him and saying to him, Do not take a wife from among the women of Canaan; And that Jacob had done as his father and mother said and had gone to Paddan-aram; It was clear to Esau that his father had no love for the women of Canaan, So Esau went to Ishmael and took Mahalath, the daughter of Abraham's son Ishmael, the sister of Nebaioth, to be his wife in addition to the wives he had.