OT-LAW.filter - lesserot ranks:

lesserot@Numbers:8:24 @ This shall be the rule for the Levites: From twenty and five years old and upward shall he go into the ranks to do the service of the tabernacle of the congregation;

lesserot@Numbers:8:25 @ And from the age of fifty years shall he go out of the ranks of the service, and he shall serve no more;