Matthew Poole and continuators on Deuteronomy 18:8

8 They shall have like portions to eat, beside that which cometh of the sale of his patrimony .

To wit, with their Brethren who were in actual ministration as they share with them in the work, so shall they also in the incouragements.

Though he have an estate whereby he may subsist raised by the sale of his House in his City, and his Cattel, and other moveables, yet you shall not upon this ground either deny or diminish their part of your maintenance. The reason of this Law was partly because he that waited on the Altar, ought to live by the Altar: and partly because it was fit he should keep his money, wherewith he might redeem what he sold, if afterwards he saw occasion for it. Heb. Besides his sales by the fathers, i. e. Of that which came to him by his Fathers, or, according to his Fathers, or, his Fathers house, and these words may be joyned not with the word immediately foregoing, but with the former part of the verse, the next word coming in by a kind of parenthesis, in this manner, and order, Besides that which cometh by the sale of their goods, they shall havelike portions to eat to what their Brethren have, each of them eating according to his Fathers house, i. e. A Gershonite shall eat with his Brethren the Gershonites who are then ministring, and a Merarite with the Merarites, &c. and so there shall be no disturbance nor change in the appointed courses by their accession to the number.

Marginal references: Heb. his sales by the fathers.