Genesis 28:6-9

Esau saw that Isaac had blessed Jacob and sent him away to Padan Aram to take himself a wife from there, and that as he blessed him he gave him a charge, saying, “You shall not take a wife from the daughters of Canaan,” and that Jacob had obeyed his father and his mother and had gone to Padan Aram. Also Esau saw that the daughters of Canaan did not please his father Isaac. So Esau went to Ishmael and took Mahalath the daughter of Ishmael, Abraham’s son, the sister of Nebajoth, to be his wife in addition to the wives he had.