Gen 28:6-9

6 Now Esau saw that Isaac had blessed Jacob and sent him away to Paddan-aram to take a wife from there, and that as he blessed him he charged him, “You shall not marry one of the Canaanite women,” 7 and that Jacob had obeyed his father and his mother and gone to Paddan-aram. 8 So when Esau saw that the Canaanite women did not please his father Isaac, 9 Esau went to Ishmael and took Mahalath daughter of Abraham’s son Ishmael, and sister of Nebaioth, to be his wife in addition to the wives he had.