John Gill Commentary 2 Chronicles 31:18

"and them that 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." — 2 Chronicles 31:18 (ASV)

And to the genealogy of all their little ones, their wives,
and their sons, and their daughters, through all the congregation
These were all genealogized and registered, wives and children, sons and daughters, whether small or grown up; and a portion was distributed to them according to their number, greater or lesser:

for in their set office they sanctified themselves in holiness ;
which is to be understood either of the overseers, who, in their set office, faithfully distributed the holy things to the persons before described; or else to the priests, and Levites, to whom, and to whose families, the distribution was made, because they wholly devoted themselves to the holy service of God.