When the boys grew up, Esau became an expert hunter, an outdoorsman, but Jacob was a quiet man who stayed at home.
References for Genesis 25:27
Isaac loved Esau because he had a taste for wild game, but Rebekah loved Jacob.
Once when Jacob was cooking a stew, Esau came in from the field, exhausted.
He said to Jacob, "Let me eat some of that red stuff, because I'm exhausted." That is why he was [also] named Edom.
References for Genesis 25:30
Jacob replied, "First sell me your birthright."
"Look," said Esau, "I'm about to die, so what good is a birthright to me?"
Jacob said, "Swear to me first." So he swore to Jacob and sold his birthright to him.
Then Jacob gave bread and lentil stew to Esau; he ate, drank, got up, and went away. So Esau despised his birthright.
References for Genesis 25:34