Numbers 4:22-23

Duties of the Kohathites

²² "Take a census of the sons of Gershon also, by their fathers' houses and by their clans. ²³ _u From thirty years old up to fifty years old, you shall list them, all who can _v come to do duty, to do service in the tent of meeting.

1. Cross References
   Numbers 4:3
   From thirty years old up to fifty years old, all who can come on duty, to do the work in the tent of meeting.
   
2. Cross References
   Numbers 8:24
   This applies to the Levites: from twenty-five years old and upward they shall come to do duty in the service of the tent of meeting.
   Exodus 38:8
   He made the basin of bronze and its stand of bronze, from the mirrors of the ministering women who ministered in the entrance of the tent of meeting.
   1 Samuel 2:22
   Now Eli was very old, and he kept hearing all that his sons were doing to all Israel, and how they lay with the women who were serving at the entrance to the tent of meeting.