John Gills Exposition of the Bible Commentary - Genesis 27:19
And Jacob said unto his father, I am Esau thy firstborn ,.... Had he only said that he was his firstborn, he might have been excused from lying, because he had bought the birthright of Esau; but when he says, I am Esau, he can by no means be excused; for to say he impersonated Esau will not do; besides, he afterwards says he was his very son Esau, Genesis 27:24 , I have done according as thou badest me ; which is another lie; for Isaac had not bid him bring him any venison, nor go... read more
Matthew Henry's Complete Commentary - 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, Ps. 58:3;... read more