Record them from age of thirty years up to the age of fifty
all who are subject to service in the performance of the tasks for the Tent of Meeting.
These are the duties of the Gershonite clans as to labor and porterage:
they shall carry the cloths of the Tabernacle, the Tent of Meeting with its covering,
the covering of tahash skin that is on top of it,
and the screen for the entrance of the Tent of Meeting....
.

                                                                                        (Numbers 4:23-25)