Genesis 25:26, 33-34

Afterward his brother came out, and his hand grasped Esau’s heel, so he was named Jacob (one who grabs by the heel, supplanter). Isaac was sixty years old when Rebekah gave birth to them.

Jacob said, “Swear [an oath] to me today [that you are selling it to me for this food]”; so he swore [an oath] to him, and sold him his birthright. Then Jacob gave Esau bread and lentil stew; and he ate and drank, and got up and went on his way. In this way Esau scorned his birthright. [Heb 12:15-17]