Rambam, Hilchot De’ot 2:6

It is forbidden to accustom oneself to smooth speech and flatteries. One must not say one thing and mean another. Inward and outward self should correspond; only what we have in mind should we utter with the mouth. We must deceive no one, not even an idolater… even a single word of flattery or deception is forbidden. A person should always cherish truthful speech, an upright spirit, and a pure heart freed of all pretense and cunning.

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