18 And he came to his father, and said, My father: and he said, Here am I: who are you, my son? 19 And Jacob said, I am Esau, your oldest son; I have done as you said: come now, be seated and take of my meat, so that you may give me a blessing. 20 And Isaac said, How is it that you have got it so quickly, my son? And he said, Because the Lord your God made it come my way. 21 And Isaac said, Come near so that I may put my hand on you, my son, and see if you are truly my son Esau or not. 22 And Jacob went near his father Isaac: and he put his hands on him; and he said, The voice is Jacob's voice, but the hands are the hands of Esau. 23 And he did not make out who he was, because his hands were covered with hair like his brother Esau's hands: so he gave him a blessing. 24 And he said, Are you truly my son Esau? And he said, I am.
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.