Numbers 4:2-6

“Take a census of the descendants of Kohath from among the sons of Levi, by their families, by their fathers’ households,

from thirty years old and upward, even to fifty years old, everyone who can enter the service of ministry to do work in the tent of meeting.

This is the work of the descendants of Kohath in the tent of meeting, concerning the most holy things.

“When the camp sets out, Aaron and his sons shall go in and take down the veil of the curtain, and cover the ark of the testimony with it;

and they shall place a covering of fine leather on it, and spread over it a cloth of pure violet, and insert its carrying poles.