Numbers 4:1-5

The Kohathites 1The LORD said to Moses and Aaron: 2“Take a census of the Kohathite branch of the Levites by their clans and families.

3Count all the men from thirty to fifty years of age who come to serve in the work at the tent of meeting. 4“This is the work of the Kohathites at the tent of meeting: the care of the most holy things. 5When the camp is to move, Aaron and his sons are to go in and take down the shielding curtain and put it over the ark of the covenant law.