What is the significance of "Dal Lo Sehdar be'Rivo"?
Rashi, Targum Onkelos and Targum Yonasan: One is not allowed to judge a poor man
favorably on the basis of the fact that he is poor and needs help.
Who one knows is guilty (Targum Yonasan).
Because it is forbidden to display pity in judgment (Targum Onkelos and Targum Yonasan), as the Torah writes in Vayikra (19:15 [Rashbam]).