Rashi on Deuteronomy 15:9/רש"י על דברים ט״ו:ט׳

1וקרא עליך AND HE CRY [UNTO THE LORD] AGAINST THEE — One might think this is a command (“he shall call against thee”). Scripture, however, states, (Deuteronomy 24:15) “[At his day thou shalt give him his hire … he is poor], so that he may not call against thee [unto the Lord]” (Sifrei Devarim 117:5).

2והיה בך חטא AND IT BE SIN UNTO THEE — under any circumstances, even if he does not cry against thee. But if this be so, to what end is it written “and he cry against thee”? It suggests that I will make greater haste to punish thee because of him who cries, than because of one who does not cry (Sifrei Devarim 117:5).