Genesis 27:41-42

41So Esau hated Jacob because of the blessing with which his father blessed him; and Esau said in his heart, “The days of mourning for my father are very near; then I will kill my brother Jacob.”

42When these words of her elder son Esau were repeated to Rebekah, she sent for Jacob her younger son, and said to him, “Listen carefully, your brother Esau is comforting himself concerning you by planning to kill you.