He discerned him not, because all his senses were not only dulled with age and infirmity, but also held by Divine Providence, as theirs, Luke 24:16, for the bringing about his own purpose; so that it is no wonder he was so grossly deceived in the whole business.
Related Commentaries of Genesis 27:23
Genesis 27:23
23 And he discerned him not, because his hands were hairy, as his brother Esau's hands: so he blessed him.