NET
33 The musicians and Levite family leaders stayed in rooms at the sanctuary and were exempt from other duties, for day and night they had to carry out their assigned tasks.
Darby
33 And these were the singers, chief fathers of the Levites, [who were] in the chambers free from service; for they were employed day and night.
KJV
33 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.