1 Chronicles 9:23-33

So they and their sons were in charge of the gates of the house of the LORD, that is, the house of the tabernacle, as guards. The gatekeepers were stationed on the four sides—on the east, west, north, and south. Their relatives in their villages were to come in every seven days from time to time to be with them; for these Levites, the four chief gatekeepers, had an official duty, and were in charge of the chambers and treasuries of the house of God. They spent the night around the house of God, for the [night] watch was theirs, and they were in charge of opening the house morning after morning. Now some of them were in charge of the serving utensils, being required to count them when they brought them in or took them out. Some of them also were appointed over the furniture and over all the [sacred] utensils of the sanctuary, as well as over the fine flour and the wine and the [olive] oil and the frankincense and the spices. Other sons of the priests prepared the mixture of spices. Mattithiah, one of the Levites, the firstborn of Shallum the Korahite, was responsible for the things baked in pans. Some of their Kohathite relatives were in charge of the showbread to prepare it every Sabbath. Now these are the singers, heads of the fathers’ households of the Levites, living in the temple chambers, free from other service because they were on duty day and night.