Numbers 4:23

4:23 You must number them from thirty years old and upward to fifty years old, all who enter the company to do the work of the tent of meeting.

Numbers 4:2

4:2 “Take a census of the Kohathites from among the Levites, by their families and by their clans,

Numbers 4:7

4:7 “On the table of the presence they must spread a blue cloth, and put on it the dishes, the pans, the bowls, and the pitchers for pouring, and the Bread of the Presence must be on it continually.