"But at the ageof fiftyyearsthey shall retirefrom servicein the workand not workanymore.
from thirtyyearsand upwardto fiftyyearsold,you shall numberthem; allwho enterto performthe serviceto dothe workin the tentof meeting.
"Thisis what[applies] to the Levites:from twenty-fiveyearsoldand upwardthey shall enterto performservicein the workof the tentof meeting.
"They may, however, assisttheir brothersin the tentof meeting,to keepan obligation,but they [themselves] shall donowork.Thusyou shall dealwith the Levitesconcerning their obligations."
I have foughtthe goodfight,I have finishedthe course,I have keptthe faith;