Deuteronomy 15:12 (KJV)

Thou shalt surely give him, and thine heart shall not be grieved when thou givest unto him: because that for this thing the Lord thy God shall bless thee in all thy works, and in all that thou puttest thine hand unto.

For the poor shall never cease out of the land: therefore I command thee, saying, Thou shalt open thine hand wide unto thy brother, to thy poor, and to thy needy, in thy land.

And if thy brother, an Hebrew man, or an Hebrew woman, be sold unto thee, and serve thee six years; then in the seventh year thou shalt let him go free from thee.

And when thou sendest him out free from thee, thou shalt not let him go away empty:

Thou shalt furnish him liberally out of thy flock, and out of thy floor, and out of thy winepress: of that wherewith the Lord thy God hath blessed thee thou shalt give unto him.