Numbers 8:26 KJV
But shall minister with their brethren in the tabernacle of the congregation, to keep the charge, and shall do no service. Thus shalt thou do unto the Levites touching their charge.
Numbers 8:26, King James Version
In context
25 And from the age of fifty years they shall cease waiting upon the service thereof, and shall serve no more:
26 But shall minister with their brethren in the tabernacle of the congregation, to keep the charge, and shall do no service. Thus shalt thou do unto the Levites touching their charge.