Verses 29-34:
Jacob "sod pottage," literally "cooked something cooked." This was likely a dish of boiled lentiles. Esau came in from a hunting trip, weary and hungry. He smelled the aroma of the meal Jacob was preparing, and his desire for food overrode everything else. The broth in the cooking pot was red, and Esau asked Jacob, "Feed me, the red one, with that red one." For this request, Esau became known also as Edom, "red."
Jacob recognized an opportunity to get what he wanted. He offered to trade a bowl of the pottage for Esau’s birthright, his rights as the firstborn son. Esau reasoned that he was about to die, and his birthright would be of no value to him if he were dead. So he traded away his birthright for a bowl of pottage. He considered the fulfillment of the immediate needs of the flesh of greater value than the future benefits of his birthright. Esau "despised," bazah, his birthright; that is, he treated it lightly, with contempt, as a thing of little lasting value. For a spiritual application of this, see Heb 12:14-17.