2 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
23:8And the Levites and all Judah do according to all that Jehoiada the priest hath commanded, and take each his men going in on the sabbath, with those going out on the sabbath, for Jehoiada the priest hath not let away the courses.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.