If we say that we have fellowship with him and walk in the darkness, we lie, and don't tell the truth.
and do not the truth: they do not say the truth, nor act according to it; they do not act uprightly or sincerely, but are hypocrites, and pretend to that which they have not; and if they did the truth, they would come to the light, and not walk in darkness; see John 3:21.