Sforno on Leviticus 19:15/ספורנו על ויקרא י״ט:ט״ו

1Now the Torah addresses the judges who are charged with dispensing fair judgment. לא תעשו עול במשפט, a warning not to relate sternly to one litigant while being lenient towards his opponent. Do not allow one litigant to sit down while his opponent is required to remain standing upright. This is followed by admonitions applicable to different levels of leadership in the people and the spirit of jealousy which often prevails between competing layers of the bureaucracy. Examples are: Doeg badmouthing David so as to gain favour with the king. (Samuel I 22,9) From such admonitions it is only a small step to warn against badmouthing people generally, especially when it even involves slander. The sin of slandering is considered so serious by the prophet Ezekiel that he describes it as being equal to bloodshed (Ezekiel 22,9)