Numbers 3:27,28

Of Kohath This family had many privileges above the others: of that were Moses and Aaron, and all the priests: they had the chief place about the tabernacle, and the care of the most holy things there, and in the land of Canaan they had twenty-three cities, which were almost as many as both their brethren received. Yet the posterity of Moses were not at all dignified or distinguished from other Levites. So far was he from seeking any advantage or honour for his own family. Keeping That is, appointed for that work, as soon as they were capable of it. Of the sanctuary That is, of the holy things contained in, or belonging to the sanctuary.