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From twenty years old - Moses had ordered that the Levites should not begin their labor till they were thirty years of age; but David changed this order, and obliged them to begin at twenty.

Both to the genealogy of the priests … - Some prefer: “And as for the list of the priests, it was according to the houses of their fathers, and that of the Levites was from twenty years,” etc. The writer states the nature of the lists which guided the officers who made the distributions. Three lists are enumerated one of the priests made out according to families; one of the Levites, including all above 20 years of age (see the marginal reference), and made out according to courses; and a third 2 Chronicles 31:18 of the priestly and Levitical families.