Deuteronómio 16:19 Comentario: Rashi, Chizkuni, Ibn Ezra & Kli Yakar

לא תטה משפט means what it literally implies: THOU SHALT NOT PERVERT JUDGMENT.

לא תטה משפט ולא תקח שוחד, “do not pervert judgment, nor accept any bribe;” earlier in Exodus 23,6 the subject of not perverting judgment when destitute people are before the court has already been discussed; here the warning concerns all the people. [The people addressed are primarily the judges. Ed.].

You [singular] must not pervert justice Scripture addresses every individual judge.

ולא תכיר פנים AND THOU SHALT NOT RESPECT PERSONS — not even if it be only during the pleadings of the parties. This is an admonition addressed to the judge that he should not be lenient to one and harsh to the other, e.g. letting one stand and the other sit; because as soon as he (the party treated harshly) observes that the judge shows more respect to his fellow his ability to plead is hampered (i.e. he loses self-confidence and cannot present his case with assurance) (cf. Shevuot 30a).