Matthew Henry on Numbers 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 was to be done regularly. 1. The Gershonites were charged with all the drapery of the tabernacle, the curtains, and hangings, and the coverings of badgers' skins, Num 4:22-26. These they were to take down when the cloud removed, and the ark and the rest of the holy things were carried away, to pack up and bring with them, and then to set up again, where the cloud rested. Aaron and his sons allotted to them their respective charge: "You shall take care of such a curtain, and you of such a hanging, that every one may know his work, and there may be no confusion…
Read the whole note in the consoleJamieson-Fausset-Brown on Numbers 4:29
As for the sons of Merari--They carried the coarser and heavier appurtenances, which, however, were so important and necessary, that an inventory was kept of them--not only on account of their number and variety, but of their comparative commonness and smallness, which might have led to their being lost or missing through carelessness, inadvertency, or neglect. It was a useful lesson, showing that God disregards nothing pertaining to His service, and that even in the least and most trivial matters, He requires the duty of faithful obedience.
John Gill on 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.
John Calvin on Numbers 4:4–end
Numbers 4:4-20, 24-28, 31-33
4. This shall be the service of the sons of Kohath in the tabernacle of the congregation, about the most holy things:
4. Istud erit opus filiorum Cehath in tabernaculo conventionis Sancti sanctorum.
5. And when the camp setteth forward, Aaron shall come, and his sons, and they shall take down the covering vail, and cover the ark of testimony with it:
5. Veniet autem Aharon et filii ejus quando transferenda erunt castra, et deponent velum tentorii, et operient illo arcata testimonii.
6. And shall put thereon the covering of badgers' skins, and shall spread over it a cloth wholly of blue, and shall put in the staves thereof.
6. Potentque super illam operimen…