Genesis 28:6-9

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; and that Jacob obeyed his father and his mother, and was gone to Padan-aram; and Esau seeing that the daughters of Canaan pleased not Isaac his father; 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.