Esau sold his birthright because he was hungry. In Genesis 25, Esau returned from the fields exhausted while his younger twin brother Jacob was cooking stew. Esau asked for some food, and Jacob demanded Esau’s birthright in exchange. Esau agreed, receiving bread and lentil stew before eating and leaving.
A birthright was more than a ceremonial title. In the patriarchal family structure described in Genesis, the firstborn normally held a privileged position and could receive a larger inheritance and family leadership. Esau’s bargain therefore exchanged a long-term privilege for immediate relief from hunger. The narrative emphasizes how lightly he treated that status.
Readers sometimes confuse this episode with the later story in which Jacob, aided by his mother Rebekah, obtains Isaac’s spoken blessing intended for Esau. The birthright sale and the stolen blessing are separate events, although together they explain why Jacob becomes the principal heir in the biblical story. Esau is also called Edom, a name associated with the red stew he requested.