These are the singers, heads of fathers' [houses] of the Levites, [who lived] in the chambers [and were] free [from other service]; for they were employed in their work day and night.
For these Levites, the four chief porters, were in their set office, and were over the chambers and treasuries of the house of God. And they lodged round about the house of God, because the charge was upon them, and the opening every morning pertained to them ( 1 Chronicles 9:26-27 ).