Numbers Chapter 8, Verse 25

25: And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more:- edit KJV text
25: And when they shall have accomplished the fiftieth year of their age, they shall cease to serve:— edit Douay text
25: And from fifty years old [the Levites] shall cease from the ministry, and shall not work any longer.— edit LXX text