TSK · Numbers 8:24

from thirty years old and upward even until fifty years old, all that enter upon the service, to do the work in the tent of meeting.

And the Levites were numbered from thirty years old and upward: and their number by their polls, man by man, was thirty and eight thousand.

and the pattern of all that he had by the Spirit, for the courts of the house of Jehovah, and for all the chambers round about, for the treasuries of the house of God, and for the treasuries of the dedicated things;

What soldier ever serveth at his own charges? who planteth a vineyard, and eateth not the fruit thereof? Or who feedeth a flock, and eateth not of the milk of the flock?

This charge I commit unto thee, my child Timothy, according to the prophecies which led the way to thee, that by them thou mayest war the good warfare;

Suffer hardship with [me], as a good soldier of Christ Jesus.