John Gill Commentary Deuteronomy 15:7

"If there be with thee a poor man, one of thy brethren, within any of thy gates in thy land which Jehovah thy God giveth thee, thou shalt not harden thy heart, nor shut thy hand from thy poor brother;" — Deuteronomy 15:7 (ASV)

If there be among you a poor man of one of your brethren
As there would be, according to the Targums of Jonathan and Jerusalem, if they did not keep the commandments of the law, and continue therein:

within any of your gates, in the land which the Lord your God gives
you ;
a native of the land was to be preferred to a foreigner, and a brother, whether in relation or religion, to a proselyte of the gate; and the poor of a city to which a man belonged, to the poor of another city, as Jarchi observes; which he gathers from this phrase,

within any of your gates: you shall not harden your heart, nor shut
your hand from your brother ;
so as not to pity his distressed case, and have no bowels of compassion for him, and feel for his want, and so as not to distribute to his necessities, and relieve him.