Genesis 25:30
"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."
Cross References (ranked by relevance)
Then the dukes of Edom shall be amazed; the mighty men of Moab, trembling shall take hold upon them; all the inhabitants of Canaan shall melt away.
Duke Magdiel, duke Iram: these be the dukes of Edom, according to their habitations in the land of their possession: he is Esau the father of the Edomites.
Thou shalt not abhor an Edomite; for he is thy brother: thou shalt not abhor an Egyptian; because thou wast a stranger in his land.
And these are the generations of Esau the father of the Edomites in mount Seir:
In his days Edom revolted from under the hand of Judah, and made a king over themselves.
Now these are the generations of Esau, who is Edom.