King James Version
This is it that belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation:New International Version
"This applies to the Levites: Men twenty-five years old or more shall come to take part in the work at the Tent of Meeting,Catholic Public Domain Version
"This is the law of the Levites: From twenty-five years and above, they shall enter to minister in the tabernacle of the covenant