Genesis 28:6-9

6Esau heard that Isaac had blessed Jacob and then sent him away to Paddan Aram. Isaac had told Jacob to find a woman from Paddan Aram that he would marry. Isaac had said to Jacob, ‘Do not marry a Canaanite woman.’

7Esau saw that Jacob had obeyed his father and mother, and that he had gone to Paddan Aram.

8So Esau then understood that his father, Isaac, did not like the Canaanite women.

9So Esau went to visit Abraham's son, Ishmael. He married Ishmael's daughter, Mahalath, the sister of Nebaioth. When Esau married Mahalath, he kept his Canaanite wives as well.