Numbers 8:25

And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more:

and from the age of fifty years they shall cease waiting on the work, and shall serve no more,

and from the age of fifty years they shall cease waiting upon the work, and shall serve no more,

and from a son of fifty years he doth return from the host of the service, and doth not serve any more,

But at the age of fifty, they must retire from performing the work and no longer serve.