Numbers 4:4

The LORD spoke to Moses and to Aaron, saying,

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

from thirty years old and upward even until fifty years old, all who enter into the service to do the work in the Tent of Meeting.

When the camp moves forward, Aaron shall go in with his sons; and they shall take down the veil of the screen, cover the ark of the Testimony with it,

put a covering of sealskin on it, spread a blue cloth over it, and put in its poles.

“On the table of show bread they shall spread a blue cloth, and put on it the dishes, the spoons, the bowls, and the cups with which to pour out; and the continual bread shall be on it.