Numbers 4:30

From thirty years old and upward ,.... The Septuagint version here, and in Numbers 4:3 , renders it, from twenty five years old and upward, agreeable to Numbers 8:24 , at the which age the Levites went into the tabernacle, to wait and to learn their business, but they did not enter upon it till thirty:

even unto fifty years old shalt thou number them ; at which age they were discharged from business:

everyone that entereth into the service, to do the work of the tabernacle of the congregation ; See Gill on Numbers 4:3 .