Deuteronomy 14:29

and the Levite (because he hath no part nor inheritance with thee) and the stranger and the fatherless and the widow which are within thy gates shall come, and shall eat and be satisfied, for once have their fill to eat and to drink; that the Lord, thy God, may bless thee in all the work of thine hand which thou doest, as a reward for this cheerful care of the poor, as it flowed out of true charity. Twice within the cycle of the Sabbatic year the tenth of the increase was thus set aside for the poor and needy, and four times it was taken to the Sanctuary of Jehovah. If the Lord blesses a Christian in his labor, the latter should not forget those that are less fortunate, lest the Lord withdraw His blessing in anger.