Komentarz do Powtórzonego Prawa 15:4

אפס כי לא יהיה בך אביון HOWBEIT THERE SHALL BE NO NEEDY AMONG YOU — But further on (v. 11) it states, “For the needy shall never cease out of the land”! But the explanation is: When you do the will of the Omnipresent the needy will be amongst the others and not amongst you, if, however, you do not the will of the Omnipresent, the needy will be amongst you (Sifrei Devarim 114:1).

אפס כי לא יהיה בך אביון, even though I have said that you must forgive overdue debts, the fact is that there will be no need for this commandment to apply in practice as there will not be anyone in that kind of need. There can hardly be a question that during all the years when Joshua was the leader of the people this promise applied and no one was in need of having past due debts forgiven. We have it on irrefutable authority that as long as Joshua and the elders of his generation were alive the Jewish people kept the Torah in an exemplary fashion. (Joshua 24,31)

אפס כי לא יהיה בך אביון, if you observe the sh’mittah regulations meticulously, G’d will recompense you.