Verse 32. - And Isaac his father said unto him, Who art thou? The language indicates the patriarch's surprise. And he said, I am thy son, thy firstborn Esau. The emphatic tone of Esau's answer may have been dictated by a suspicion, already awakened by Isaac's question, that all was not right (Inglis). Esau's claim to be regarded as Isaac's firstborn, after having bartered away his birthright, is considered by some to be unwarranted (Wordsworth); but it is doubtful if Esau attached the importance to the term "firstborn" which this objection presupposes.

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.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.