Genesis 27:3

Take me some venison In this Isaac designed, not so much the refreshment of his own spirits, as the receiving a fresh instance of his son's filial duty and affection to him, before he bestowed the designed favour upon him. That my soul may bless thee before I die May confer my solemn, extraordinary, and prophetic blessing, and thereby may declare and constitute thee the heir of all the blessings bestowed by God upon me and my fathers. For it was no common blessing that Isaac meant for Esau, but that important patriarchal benediction which chiefly related to the peculiar and extraordinary covenant which God entered into with Abraham, to be a God to him and his seed, and to give them the land of Canaan, and in particular to that fundamental part of it, that the Messiah should be of his seed, and bless all the families of the earth. Isaac, out of a fond affection for Esau, endeavoured to entail this blessing on him, unmindful of the oracle that the elder should serve the younger.