Judging Righteously

דברים פרק א טז בֵּּין-אִיש וּבֵּין - ורֵּ
ג ןיֵּבּו ויִחָא
אמר רב יהודה, "בין איש ובין אחיו" אפילו בין בית לעליה, "ובין גרו" אפילו בין תנור לכירים (סנהדרין ז' ב')

Many attempt to explain this d’rasha.
T.T. Even when a case comes to a judge between people that appear to be “small” (that really makes very little difference in the world if the house goes to this person, or the attic goes to that person) then the judge might think it is not important to judge carefully. Rather, in all cases a judge must look into the matter deeply and carefully according to the laws of Torah and bring forth a righteous judgment.
Thus, the end of the d’rasha applies even when a גר לביתו, one’s neighbor, sets aside an oven for someone else’s use.