Genesis 25:29-34

One day, when Jacob was cooking a stew, Esau returned from hunting, and he was famished. Smelling the aroma of food, Esau said to Jacob, “I’m starving! Let me eat some of that red stuff you’re cooking.” (This is why he is also called Edom.) “Yes, but first you must trade me your birthright,” Jacob replied. “Can’t you see I’m dying of hunger?” Esau said. “What good is the birthright if I’m dead?” But Jacob insisted, “First, swear to me that you’ll give it to me.” So, Esau swore an oath and surrendered his birthright to Jacob. Then Jacob gave Esau some lentil stew and bread. When Esau had finished eating and drinking, he just got up and walked away. Esau cared nothing about his own birthright.