Genesis 28:6-9

6 When Esau saw that Isaac had blessed Jacob and sent him away to Padan-aram to take him a wife from thence, and that, as he blessed him, he gave him a charge, saying, Thou shalt not take a wife of the daughters of Canaan, 7 And that Jacob obeyed his father and his mother and was gone to Padan-aram, 8 And Esau, seeing that the daughters of Canaan pleased not Isaac his father, 9 Then went Esau unto Ishmael and took unto the wives which he had Mahalath, the daughter of Ishmael, Abraham’s son, the sister of Nebajoth, to be his wife.