And Isaac his father said unto him, who art thou?.... Hearing another voice more like Esau's than what he had heard before surprised him, and therefore in haste puts this question:

and he said, I am thy son, thy firstborn Esau; all which was true in a sense; he was his son, and he was Esau, and he was his firstborn by nature, but not by right, for he had sold his birthright.

And Isaac his father said unto him, Who art thou? And he said, I am thy son, thy firstborn Esau.

27:27-31 He kissed him; in token of particular affection to him. Those that are blessed of God are kissed with the kisses of his mouth, and they do by love and loyalty kiss the son, Psa 2:12.
2. He praised him. Upon occasion of the sweet smell of his garments he said, See the smell of my son is as the smell of a field which the Lord hath blessed - That is, like that of the most fragrant flowers and spices. Three things Jacob is here blessed with, Plenty, Ge 27:28. Heaven and earth concurring to make him rich. Power, Ge 27:29. Particularly dominion over his brethren, viz. Esau and his posterity. Prevalency with God, and a great interest in heaven, Cursed be every one that curseth thee - Let God be a friend to all thy friends, and an enemy to all thine enemies. Now, certainly more is comprised in this blessing than appears at first; it must amount to an entail of the promise of the Messiah: that was in the patriarchal dialect the blessing; something spiritual doubtless is included in it. First, That from him should come the Messiah, that should have a sovereign dominion on earth. See Num 24:19. Out of Jacob shall come he that shall have dominion, the star and scepter, Nu 24:17. Jacob's dominion over Esau was to be only typical of this, Gen 49:10. Secondly, That from him should come the church that should be particularly owned and favoured by Heaven. It was part of the blessing of Abraham when he was first called to be the father of the faithful, Gen 12:3. I will bless them that bless thee; therefore when Isaac afterwards confirmed the blessing to Jacob, he called it the blessing of Abraham, Gen 28:4.

27:30-40 When Esau understood that Jacob had got the blessing, he cried with a great and exceeding bitter cry. The day is coming, when those that now make light of the blessings of the covenant, and sell their title to spiritual blessings for that which is of no value, will, in vain, ask urgently for them. Isaac, when made sensible of the deceit practised on him, trembled exceedingly. Those who follow the choice of their own affections, rather than the Divine will, get themselves into perplexity. But he soon recovers, and confirms the blessing he had given to Jacob, saying, I have blessed him, and he shall be blessed. Those who part with their wisdom and grace, their faith and a good conscience, for the honours, wealth, or pleasures of this world, however they feign a zeal for the blessing, have judged themselves unworthy of it, and their doom shall be accordingly. A common blessing was bestowed upon Esau. This he desired. Faint desires of happiness, without right choice of the end, and right use of the means, deceive many unto their own ruin. Multitudes go to hell with their mouths full of good wishes. The great difference is, that there is nothing in Esau's blessing which points at Christ; and without that, the fatness of the earth, and the plunder of the field, will stand in little stead. Thus Isaac, by faith, blessed both his sons, according as their lot should be.