Genesis 25:27-31

When the boys grew up, Esau became a skillful hunter, a man of the field; but Jacob was a civilized man, living in tents.

Now Isaac loved Esau because he had a taste for game; but Rebekah loved Jacob.

When Jacob had cooked a stew one day, Esau came in from the field and he was exhausted;

and Esau said to Jacob, “Please let me have a mouthful of that red stuff there, for I am exhausted.” Therefore he was called Edom by name.

But Jacob said, “First sell me your birthright.”