4:21-33 We have here the charge of the other two families of the Levites, which, though not so honourable as the first, yet was necessary, and to be done regularly. All the things were delivered them by name. It intimates the care God takes of his church and every member of it. The death of the saints is represented as the taking down of the tabernacle, 2Co 5:1, and the putting it off, 2Pe 1:14. All shall be raised up in the great day, when these vile bodies shall be made like the glorious body of Jesus Christ, and so shall be for ever with the Lord.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.