1 Chronicles 23:25 -

For David said . The "for" of this clause cannot be supposed to account exclusively for the inclusion in the census of Levites beginning from the age of twenty years; it accounts no doubt for the whole proceeding. Since there would be no more journeyings for people, for buildings, or for sacred vessels, it was nosy fully time to organize religious duty and "the service of the house of God" in a manner adapted to permanent institutions. In order to this, the first step was to know and to arrange the number of those who were answerable for sacred duties.