Deuteronomy 15:3

3.Of a foreigner thou mayest exact it. An exception follows, that it should be lawful to sue foreigners, and to compel them to pay; and this for a very good reason, because it was by no means just that despisers of the Law should enjoy the Sabbatical benefit, especially when God had conferred the privilege on His elect people alone. What follows in the next verse, “Unless because there shall be no beggar,” interpreters twist into various senses. Some translate it, Nevertheless ( veruntamen,) let there be no beggar among thee; as if it were a prohibition, that they should not suffer their poor brethren to be overwhelmed with poverty, without assisting them; and, lest they should object that, if they should be so liberal in giving, they would soon exhaust themselves, God anticipates them, and bids them rely upon his blessing. Others, however, understand it as a promise, and connect it thus, That there should be no beggar among them, if only they keep the Law, since then God would bless them. Nor would this meaning be very unsuitable. What they mean who expound it, Insomuch that there should be no beggar with thee, I know not. Let my readers, however, consider whether (146) אפס כי, ephes ci, is not better rendered “unless because,” ( nisi quod:) and then this clause would be read parenthetically, as if it were said, Whenever there shall be any poor among your brethren, an opportunity of doing them good is presented to you. Therefore the poverty of your brethren is to be relieved by you, in order that God may bless you. But, that the sentence may be clearer, I take the two words, אפס כי, ephes ci, exclusively, as if it were, On no account let there be a beggar: or, howsoever it. may be, suffer not that by your fault there should be any beggar amongst you; for He would put an end to all vain excuses, and, as necessity arose, would have them disposed to give assistance, lest the poor should sink under the pressure of want and distress, tie does not, therefore, mean generally all poor persons, but only those in extreme indigence; such as the Prophet Amos complains are “sold for a pair of shoes.” ( Amos 2:6.) In order, then, that they may more cheerfully assist their distresses, He promises that His blessing shall be productive of greater abundance. And from hence Paul seems to have derived his exhortation to the Corinthians:

“He which soweth bountifully, shall reap also bountifully. God is able to make all grace abound toward you; that ye, always having all sufficiency in all things, may abound to every good work.: Now he that ministereth seed to the sower, shall both minister bread for your food, and multiply your seed sown, and increase the fruits of your righteousness, that, being enriched in every thing, you may abound unto all bountifulness.” (2 Corinthians 9:6.)

In short, God would have them without carefulness, since He will abundantly recompense them with His blessing, if they have diminished their own stores by liberality to the poor.