Genesis 27:41-42

41Esau held a grudge against Jacob because of the blessing his father had given him. And Esau determined in his heart, “The days of mourning for my father are approaching; then I will kill my brother Jacob.”

42When the words of her older son Esau were reported to Rebekah, she summoned her younger son Jacob and said to him, “Listen, your brother Esau is consoling himself by planning to kill you.