“Some of the sons of the Kohathites, some of their brethren.” The Korahites, to which house Shallum and Mattithiah belonged, were a subdivision of the great clan of Kohath.
The shewbread. — See Leviticus 24:5-9. Here it is called “Bread of the Pile;” another name was “Bread of the Presence.”
To prepare it every sabbath. — The Levites had to get it ready for the priests to lay it fresh on the golden table, after removing the old bread, every Sabbath.