Mishpatim: Ohr HaChaim HaKodesh: Mitzvah 84 – Concept 558
“Do not glorify a destitute person in his litigation.” (Exodus 23:3) The judge must not have mercy on the poor person at the trial. (Rambam, Hilchot Sanhedrin)
The extra word, “B’rivo,” in his litigation, contains a moral/ethical message based on Vayikra Rabba 34, that the poor person is liable to engage in a confrontation with God, asking Him why He supplies everyone else with their needs whereas he is hungry and naked. Everyone who gives even a copper coin to poor person stills his hunger, and prevents him from complaining to God and accusing Him of not being gracious to the poor. On the other hand, at times when no one on earth is gracious to the poor, his argument is very powerful.
The Torah therefore commands us to not contribute to strengthening the voice of the poor who accuse God of insensitivity to their fate. – Ohr Hachaim Hakadosh