I shall bring a curse upon me - For even in those early times the spirit of that law was understood, Deuteronomy 27:18 : Cursed is he that maketh the blind to wander out of the way; and Jacob seems to have possessed at this time a more tender conscience than his mother.

My father peradventure will feel me,.... For, though he could not see him, and so discern whether he had any hair or no on him, yet, suspecting him by his voice, he might call him to him to feel him, as he did; for Jacob understood his mother right, that he was to represent his brother Esau in the transaction of this affair:
and I shall seem to him as a deceiver; one that imposes upon another and causes him to err, leads him to say or do wrong things: and not only appear as one, but be really one, and even a very great one, as the doubling of the radical letters in the word shows; yea, the worst of deceivers, a deceiver of a parent, of one that was both aged and blind:
and I shall bring a curse upon me, and not a blessing; and he might justly fear, that should he be found out, it would so provoke his father, that instead of blessing him, he would curse him, see Deuteronomy 27:18.