Charles Ellicott Commentary 1 Chronicles 9:32

"And some of their brethren, of the sons of the Kohathites, were over the showbread, to prepare it every sabbath." — 1 Chronicles 9:32 (ASV)

“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.