2 Chronicles 23:4

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

And their brothers in their villages, were to come in for seven days from time to time with them.

And the Levites were numbered from the age of thirty years and upward. And their number by their heads, man by man, was thirty-eight thousand.

And David distributed them according to their offices in their service, both Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar.

And they cast lots, the small as well as the great, according to the house of their fathers, for every gate.

And it happened in his serving 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 were numbered from the age of thirty years and upward. And their number by their heads, man by man, was thirty-eight thousand.

And David distributed them according to their offices in their service, both Zadok of the sons of Eleazar, and Ahimelech of the sons of Ithamar.

And it happened in his serving in the order of his course, before God,

And they cast lots, the small as well as the great, according to the house of their fathers, for every gate.