הוכח תוכיח את עמיתך ולא תשא עליו חטא
The Bialystoker Maggid, zl (cited by Horav Gedalya Schorr, zl), posits that we have two forms of tochachah, rebuke. In one instance, the rebuker chastises his fellow, saying, “How could you commit such a sin?” Another scenario has the rebuker challenging his fellow, alleging, “Who are you (who do you think you are) to have the audacity to commit such a grave sin?” In both instances, the rebuker is magnifying the sin and making it greater/larger than the sinner. He is either too small or the sin is too large, but, in any event, the offense is greater than the…
