Deuteronomy 15:7,8

Thou shalt not shut thy hand from thy poor brother Because this law might tend to make some people cautious and niggardly in lending to the poor, as being assured they should lose the debt at the seventh year, if it were not paid before; or, upon this account, might make them sparing of their charities in other matters; Moses here cautions them against being influenced by so mean a principle, and charges every Israelite to look upon his poor neighbour as a brother, equally related to God as himself, who therefore would be sure to punish all uncharitableness to such as were his own people, as he would be to bless and reward those who, with a generous and bountiful heart, gratefully depended on his providence, and obeyed his commands. Open thy hand That is, deal bountifully and liberally with him.