His father Isaac asked him, “Who are you?” “I’m Esau, your firstborn son,” he answered.
and he took them to Isaac. “Father?” Jacob said. Isaac replied, “Which one of my sons are you?”
But Jacob insisted, “First, swear to me that you’ll give it to me.” So, Esau swore an oath and surrendered his birthright to Jacob.
Then Jacob gave Esau some lentil stew and bread. When Esau had finished eating and drinking, he just got up and walked away. Esau cared nothing about his own birthright.