2 Chronicles 31:17

17 and those who were reckoned by genealogy of the Kohanim by their fathers' houses, and the Levites from twenty years old and upward, in their offices by their courses;

2 Chronicles 31:17 Meaning and Commentary

2 Chronicles 31:17

Both to the genealogy of the priests by the house of their
fathers
As to the priests registered according to their families from the age before observed, a portion was given: so to the Levites,

from twenty years old and upward, in their charges, by their courses;
for though originally they were not admitted into the tabernacle till twenty five years of age, nor to officiate till thirty, but in David's time they were allowed at twenty years of age and upwards, ( 1 Chronicles 23:24 ) .

2 Chronicles 31:17 In-Context

15 Under him were `Eden, and Minyamin, and Yeshua, and Shemayah, Amaryah, and Shekhanyahu, in the cities of the Kohanim, in their office of trust, to give to their brothers by courses, as well to the great as to the small:

16 besides those who were reckoned by genealogy of males, from three years old and upward, even everyone who entered into the house of the LORD, as the duty of every day required, for their service in their offices according to their courses;

17 and those who were reckoned by genealogy of the Kohanim by their fathers' houses, and the Levites from twenty years old and upward, in their offices by their courses;

18 and those who were reckoned by genealogy of all their little ones, their wives, and their sons, and their daughters, through all the congregation: for in their office of trust they sanctified themselves in holiness.

19 Also for the sons of Aharon the Kohanim, who were in the fields of the suburbs of their cities, in every city, there were men who were mentioned by name, to give portions to all the males among the Kohanim, and to all who were reckoned by genealogy among the Levites.