Verse 12

And when Esau saw that Jacob had fled and escaped from him, and that Jacob had cunningly obtained the blessing, then Esau grieved exceedingly, and he was also vexed at his father and mother; and he also rose up and took his wife and went away from his father and mother to the land of Seir, and he dwelt there; and Esau saw there a woman from amongst the daughters of Heth whose name was Bosmath, the daughter of Elon the Hittite, and he took her for a wife in addition to his first wife, and Esau called her name Adah, saying the blessing had in that time passed from him.