1 Chronicles 9:31
And Mattithiah, one of the Levites, who was the firstborn of Shallum the Korahite, had the set office over the things that were made in the pans. And Mattithiah, one of the Levites, who was the firstborn of Shallum the Korahite, had the set office over the things that were made in the pans.
Mattithiah, a Levite and the firstborn of Shallum the Korahite, held the set and appointed office over the things made in pans, the food, offerings and items prepared in pans. Temple work was divided among the priests and Levites and other workers, with each having his assigned duty, of which Mattithiah's oversight was one part. The appointment illustrates the hereditary duties and temple-service offices preserved in the genealogical records of Chronicles.
The account belongs to the temple service after the return from Babylon. The order of service in that surrounding account was originally established by David and Samuel. The surrounding account mentions the Sabbath.