אֶ֕פֶס כִּ֛י לֹ֥א יִֽהְיֶה־בְּךָ֖ אֶבְי֑וֹן כִּֽי־בָרֵ֤ךְ יְבָֽרֶכְךָ֙ יְהוָ֔ה בָּאָ֕רֶץ אֲשֶׁר֙ יְהוָ֣ה אֱלֹהֶ֔יךָ נֹֽתֵן־לְךָ֥ נַחֲלָ֖ה לְרִשְׁתָּֽהּ׃
然而，在你中間必沒有窮乏的人，因為在永恆者你的上帝賜給你作產業、讓你得為業的地上，永恆者必大大賜福給你。
Rashi
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).
Ibn Ezra
However… The sense of this passage is: Know that there might be no need for that which I have commanded you concerning not pressing your brother for payment; for there will be no one among you in need of your lending to him if all (or the majority) of Israel hearkens unto the voice of God . Rather, you will all secure loans from many nations (meaning, that you will take their “security” — i.e., “collateral” — for the money that you will give them, which they need in order to engage in commerce).
Rashbam
אפס כי לא יהיה בך אביון, if you observe the sh’mittah regulations meticulously, G’d will recompense you.