Musar do Rodzaju 10:78

The third category is where one lies to his fellow not to rob him of anything he possesses, but he learns that a certain good thing is going to come to his fellow in the future, and so with falsehood and with cunning he praises this good fortune that is coming, and makes it appear that he has a share in it. Or he lies to his fellow until he gives him a gift, for example, he brings him good tidings — false tidings — in order to get a gift because of this. And there are many similar cases. And our Sages, of blessed memory, said, "Whoever dissembles in his speech is as though he had practiced idolatry" (Sanh. 92a). As it is said, "My father peradventure will feel me, and I shall seem to him as a mocker" (Gen. 27:12). And it is said, concerning idolatry, "They are vanity, a work of delusion" (Jer. 10:15). Now this does not mean that one who lies is actually like one who worships idols, but the resemblance is there, for he conceals himself in falsehood and is helped by empty things.