Genesis 27:41-42

41Because Isaac had blessed Jacob, Esau hated his younger brother Jacob. Esau said quietly, ‘My father will die soon. When we have buried his body, I will kill my brother.’

42Someone told Rebekah what her older son, Esau, had said. So she told her younger son, Jacob, to come to her. She said to him, ‘Your brother Esau wants to kill you, because of what you did to him.