and from the age of fifty years they shall cease waiting on the work, and shall serve no more,
Referenced Verses
Num 4:23 : 23 you shall count them from thirty years old and upward until fifty years old; all who enter in to wait on the service, to do the work in the Tent of Meeting.
2 Tim 4:7 : 7 I have fought the good fight. I have finished the course. I have kept the faith.