Numbers 3:28
all the males a month old and above numbered 8,600. They were tasked to the care of the sanctuary.
Numbers 3:7
They are to take care of his needs and the needs of the whole congregation at the Tent of Meeting by performing duties at the tent.
Numbers 3:31
Their duties pertained to the ark, the table, the lamp stand, the altars, the utensils of the sanctuary with which they ministered, and all the curtains in use.
Numbers 4:35-36
from 30 to 50 years old that is, everyone who entered the service to perform work at the Tent of Meeting.