2 Chronicles 23:4

This is the thing that ye do: The third of you, going in on the sabbath, of the priests, and of the Levites, are for gatekeepers of the thresholds,

And their brethren in their villages are to come in for seven days from time to time with these.

and the Levites are numbered from a son of thirty years and upward, and their number, by their polls, is of mighty men thirty and eight thousand.

And David distributeth them, and Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar, according to their office in their service;

and they cause to fall lots, as well the small as the great, according to the house of their fathers, for gate and gate.

And it came to pass, in his acting as priest, in the order of his course before God,

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This is the thing that ye shall do; A third part of you entering on the sabbath, of the priests and of the Levites, shall be porters of the doors;

and the Levites are numbered from a son of thirty years and upward, and their number, by their polls, is of mighty men thirty and eight thousand.

And David distributeth them, and Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar, according to their office in their service;

And it came to pass, in his acting as priest, in the order of his course before God,

and they cause to fall lots, as well the small as the great, according to the house of their fathers, for gate and gate.