Here I am going to die, what is the birthright to me?! This teaches that he committed heresy. Another interpretation: Here I am going to die etc. That he warred with Nimrod and was afraid that Nimrod might kill him. Another interpretation: Here I am etc. That offerings kill their masters when those who offer them are not righteous, and I am not righteous. What is this birthright to me?! That I will die before my time (to claim it). Another interpretation: Here I etc. I give offerings and work in service to God and I am going to die like people who do not give offerings. If so, why do I work in God's service? Therefore he decided for himself to sell his birthright to Jacob.