1 Chronicles 9:33

And these [were] the singers, heads of families of the Levites, [to whom were] established daily courses, for they were employed in the services day and night.

And these are the singers, chief of the fathers of the Levites, who remaining in the chambers were free: for they were employed in that work day and night.

These are the singers, heads of fathers’ households of the Levites, who lived in the rooms and were free from other service, for they were employed in their work day and night.