1 Chronicles 23:30-32

30Every morning they stood in their places to thank the Lord and to praise him. They did the same thing every evening.

31They also did that when the priests offered burnt offerings to the Lord. That happened on Sabbath days, at New Moon festivals and on other special days. The correct number of Levites must be there to serve the Lord at all times, as the rules commanded.

32In that way, the Levites had authority to take care of the special tent and the holy place. They helped their relatives, Aaron's descendants, as they served the Lord in his temple.