It's no surprise that the halakhah frowns upon deceptive behavior (g'neivat da`at). We are forbidden to act in such a way as to create a false impression in the minds of others, even when our action causes them no material loss, simply because deception in and of itself is a bad thing. But howbad is it? Are we always forbidden to deceive? Without exception?
Well, there's a machloket about that.
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