'Courses' in the Bible

And David divided them into courses among the sons of Levi, namely, Gershon, Kohath, and Merari.

And to the sons of Aaron are their courses: sons of Aaron are Nadab, and Abihu, Eleazar, and Ithamar,

For the courses of the gatekeepers: of the Korhites is Meshelemiah son of Kore, of the sons of Asaph;

With respect to their leaders, these courses of trustees had responsibilities, along with their relatives, regarding ministry within the Temple of the LORD

These are the courses of the gatekeepers, of the sons of the Korhite, and of the sons of Merari.

Now the children of Israel after their number, to wit, the chief fathers and captains of thousands and hundreds, and their officers that served the king in any matter of the courses, which came in and went out month by month throughout all the months of the year, of every course were twenty and four thousand.

And David assembleth all the heads of Israel, heads of the tribes, and heads of the courses who are serving the king, and heads of the thousands, and heads of the hundreds, and heads of all the substance and possessions of the king, and of his sons, with the officers and the mighty ones, even to every mighty one of valour -- unto Jerusalem.

Also for the courses of the priests and the Levites, and for all the work of the service of the house of the LORD, and for all the vessels of service in the house of the LORD.

And, behold, the courses of the priests and the Levites, even they shall be with thee for all the service of the house of God: and there shall be with thee for all manner of workmanship every willing skilful man, for any manner of service: also the princes and all the people will be wholly at thy commandment.