Numbers 4:19

But thus do unto them
As after directed:

that they may live and not die;
live long, and not die a sudden and violent death:

when they approach unto the most holy things;
the ark, the shewbread table to take them up and carry them:

Aaron and his sons shall go in;
into the holy and most holy places:

and appoint them in everyone to his service, and to his burden;
what everyone shall do, and how they shall take them up, and bear them.