18 So Jacob took the food to his father. "My father?" he said. "Yes, my son," Isaac answered. "Who are you-Esau or Jacob?" 19 Jacob replied, "It's Esau, your firstborn son. I've done as you told me. Here is the wild game. Now sit up and eat it so you can give me your blessing." 20 Isaac asked, "How did you find it so quickly, my son?" "The Lord your God put it in my path!" Jacob replied. 21 Then Isaac said to Jacob, "Come closer so I can touch you and make sure that you really are Esau." 22 So Jacob went closer to his father, and Isaac touched him. "The voice is Jacob's, but the hands are Esau's," Isaac said. 23 But he did not recognize Jacob, because Jacob's hands felt hairy just like Esau's. So Isaac prepared to bless Jacob. 24 "But are you really my son Esau?" he asked. "Yes, I am," Jacob replied.
Matthew Henry's Commentary on Genesis 27:18-24
Commentary on Genesis 27:18-29
(Read Genesis 27:18-29)
Jacob, with some difficulty, gained his point, and got the blessing. This blessing is in very general terms. No mention is made of the distinguishing mercies in the covenant with Abraham. This might be owing to Isaac having Esau in his mind, though it was Jacob who was before him. He could not be ignorant how Esau had despised the best things. Moreover, his attachment to Esau, so as to disregard the mind of God, must have greatly weakened his own faith in these things. It might therefore be expected, that leanness would attend his blessing, agreeing with the state of his mind.