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; that the LORD thy God may bless thee in all the work of thine hand which thou doest. And the Levite (because he hath no part nor inheritance - And hence much of his support depended on the mere freewill-offerings of the people. God chose to make his ministers thus dependent on the people, that they might be induced (among other motives) to labor for their spiritual profiting, that the people, thus blessed under their ministry, might feel it their duty and privilege to support and render them comfortable.
Commentary on the Bible, by Adam Clarke [1831].