Komentaryo sa Genesis 27:4: Chizkuni, Ramban, Sforno & Radak

והביאה לי ואוכלה, “and bring it to me so that I may eat it.” Yitzchok said to Esau that he had sold his birthright in order to taste part of a single meal. He would now restore it to him by his acquiring the merit of feeding his father a meal prepared by him. This is what was meant by the words: הוי גביר לאחיך “become senior to your brother.” (27,29) [The reader is reminded that the blessing Yitzchok bestowed on the brother who fed him, Yaakov, had been intended for Esau. Ed.]

THAT MY SOUL MAY BLESS THEE. It was Isaac’s intent to bless Esau that he merit the blessing of Abraham to inherit the land and to become the one with whom G-d would make the covenant since he was the firstborn.
It would appear that Rebekah never told Isaac of the prophecy which G-d had related to her, i.e., And the elder shall serve the younger,¹⁹⁹Above, 25:23. else how would Isaac transgress the commandment of the Eternal, seeing that it shall not prosper.²⁰⁰Numbers 14:41. Now at first she did not tell it to him due to ethical modesty, for the verse, And she went to inquire of the Eternal,²⁰¹Above, 25:22. suggests that she went without Isaac’s permission.²⁰²Hence due to ethical modesty she did not tell him of the prophecy for it would indicate a breach of wifely modesty for her to have gone without permission. [Perhaps she did not tell him because] she said, “I need not relate a prophecy to a prophet for Isaac is greater than the one who told it to me.”²⁰³This is a reference to the tradition mentioned by Rashi (25:23), which says that the prophecy was told to Shem the son of Noah and he told it to Rebekah. Therefore Rebekah said: “There is no reason for me to tell Isaac since he is greater in prophecy than the one who told it to me.” And now she did not want to tell him, “So was it said to me in the name of G-d before I gave birth,” for she reasoned that because of his love for Esau he will not bless Jacob, but he will leave everything in the hands of Heaven. And she further knew that by this arrangement of hers, Jacob will be blessed from Isaac’s mouth by an undivided heart and a willing mind. Perhaps these are causes induced by G-d so that Jacob would be blessed, and Esau as well with the blessing of the sword, And by Him alone actions are weighed.²⁰⁴I Samuel 2:3.

Made it into a tasty dish. Yitzchok knew that Eisov was not worthy of the blessing that he wished to confer upon him. For this reason he instructed him to perform an act of honor towards him to give him merit. By contrast when he blessed Yaakov (28:3) he knew that he needed no additional merit.