Matthew Henry on Genesis 27:18-29
Observe here, I. The art and assurance with which Jacob managed this intrigue. Who would have thought that this plain man could have played his part so well in a design of this nature? His mother having put him in the way of it, and encouraged him in it, he dexterously applied himself to those methods which he had never accustomed himself to, but had always conceived an abhorrence of. Note, Lying is soon learnt. The psalmist speaks of those who, as soon as they are born, speak lies, Psa 58:3; Jer 9:5. I wonder how honest Jacob could so readily turn his tongue to say (Gen 27:19), I am Esau thy first-born; nor do I see how the endeavour of some to bring him off with that equivocation, I am mad…
Read the whole note in the consoleJamieson-Fausset-Brown on Genesis 27:18
he came unto his father--The scheme planned by the mother was to be executed by the son in the father's bedchamber; and it is painful to think of the deliberate falsehoods, as well as daring profanity, he resorted to. The disguise, though wanting in one thing, which had nearly upset the whole plot, succeeded in misleading Isaac; and while giving his paternal embrace, the old man was roused into a state of high satisfaction and delight.
Adam Clarke on Genesis 27:23
And he discerned him not, because his hands were hairy - From this circumstance we may learn that Isaac's sense of feeling was much impaired by his present malady. When he could not discern the skin of a kid from the flesh of his son, we see that he was, through his infirmity, in a fit state to be imposed on by the deceit of his wife, and the cunning of his younger son.
John Gill on Genesis 27:24
And said, art thou my very son Esau?.... Still having some doubt on his mind whether he really was so or not, because of his voice:
and he said, I am; as for the observation of Jarchi upon this, in order to excuse Jacob from lying, that he does not say, "I am Esau", only "I", it will not do, since it is an answer to Isaac's question, with a design to deceive him; and he intended by it that he should understand him as he did, that he was really Esau.