Genesis 25:27 (KJV)

And the children struggled together within her; and she said, If it be so, why am I thus? And she went to enquire of the LORD.

And the LORD said unto her, Two nations are in thy womb, and two manner of people shall be separated from thy bowels; and the one people shall be stronger than the other people; and the elder shall serve the younger.

And when her days to be delivered were fulfilled, behold, there were twins in her womb.

And the first came out red, all over like an hairy garment; and they called his name Esau.

And after that came his brother out, and his hand took hold on Esau's heel; and his name was called Jacob: and Isaac was threescore years old when she bare them.

And Isaac loved Esau, because he did eat of his venison: but Rebekah loved Jacob.

And Jacob sod pottage: and Esau came from the field, and he was faint:

And Esau said to Jacob, Feed me, I pray thee, with that same red pottage; for I am faint: therefore was his name called Edom.

And Jacob said, Sell me this day thy birthright.

And Esau said, Behold, I am at the point to die: and what profit shall this birthright do to me?