Numbers 4:35

These were the sons of Levi after the house of their fathers; even the chief of the fathers, as they were counted by number of names by their polls, that did the work for the service of the house of the Lord, from the age of twenty years and upward.

From thirty years old and upward until fifty years old shalt thou number them; all that enter in to perform the service, to do the work in the tabernacle of the congregation.

And also unto the Levites; they shall no more carry the tabernacle, nor any vessels of it for the service thereof. For by the last words of David the Levites were numbered from twenty years old and above:

Now the Levites were numbered from the age of thirty years and upward: and their number by their polls, man by man, was thirty and eight thousand.

Also for the courses of the priests and the Levites, and for all the work of the service of the house of the Lord, and for all the vessels of service in the house of the Lord.

Not a novice, lest being lifted up with pride he fall into the condemnation of the devil.

And Jesus himself began to be about thirty years of age, being (as was supposed) the son of Joseph, which was the son of Heli,

From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.

From thirty years old and upward even unto fifty years old shalt thou number them, every one that entereth into the service, to do the work of the tabernacle of the congregation.

From thirty years old and upward even unto fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation,

From thirty years old and upward even unto fifty years old, every one that entereth into the service, for the work in the tabernacle of the congregation,

From thirty years old and upward even unto fifty years old, every one that came to do the service of the ministry, and the service of the burden in the tabernacle of the congregation,

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