1 Chronicles 23:31-32

Complete Jewish Bible

³¹ They were to be present regularly before Adonai whenever burnt offerings were offered to Adonai on Shabbat, at Rosh-Hodesh, and at the other designated times, in the numbers required by the rules for sacrifices. ³² Finally, for the service in the house of Adonai they were to perform their duties in relation to the tent of meeting, the Holy Place and their kinsmen the descendants of Aharon.