Genesis 27:41-42

41Now Esau hated Jacob because of the blessing with which his father had blessed him, and Esau said to himself, "The days of mourning for my father are approaching; then I will kill my brother Jacob."

42But the words of Esau her older son were told to Rebekah. So she sent and called Jacob her younger son and said to him, "Behold, your brother Esau comforts himself about you by planning to kill you.