Jamieson, Fausset and Brown on Genesis 27:18-27

18-27. 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.