2 Chronicles 8:14
And he appointed, according to the order of David his father, the courses of the priests to their service, and the Levites to their charges, to praise and minister before the priests, as the duty of every day required: the porters also by their courses at every gate: for so had David the man of God commanded.
Torrey's Topical Textbook—AKJV

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 porters of the doors;
Torrey's Topical Textbook—AKJV