28 At the end of every three years thou shalt bring forth all the tithe of thine increase in the same year, and shalt lay it up within thy gates: 29 and the Levite, because he hath no portion nor inheritance with thee, and the sojourner, and the fatherless, and the widow, that are within thy gates, shall come, and shall eat and be satisfied; that Jehovah thy God may bless thee in all the work of thy hand which thou doest.

Matthew Henry's Commentary on Deuteronomy 14:28-29

Commentary on Deuteronomy 14:22-29

(Read Deuteronomy 14:22-29)

A second portion from the produce of their land was required. The whole appointment evidently was against the covetousness, distrust, and selfishness of the human heart. It promoted friendliness, liberality, and cheerfulness, and raised a fund for the relief of the poor. They were taught that their worldly portion was most comfortably enjoyed, when shared with their brethren who were in want. If we thus serve God, and do good with what we have, it is promised that the Lord our God will bless us in all the works of our land. The blessing of God is all to our outward prosperity; and without that blessing, the work of our hands will bring nothing to pass. The blessing descends upon the working hand. Expect not that God should bless thee in thy idleness and love of ease. And it descends upon the giving hand. He who thus scatters, certainly increases; and to be free and generous in the support of religion, and any good work, is the surest and safest way of thriving.