Bible Verses About Porters: They served in twenty-four courses

All these which were chosen to be porters in the gates were two hundred and twelve. These were reckoned by their genealogy in their villages, whom David and Samuel the seer did ordain in their set office.

And the singers the sons of Asaph were in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king's seer; and the porters waited at every gate; they might not depart from their service; for their brethren the Levites prepared for them.

Also they were over the bearers of burdens, and were overseers of all that wrought the work in any manner of service: and of the Levites there were scribes, and officers, and porters.

For these Levites, the four chief porters, were in their set office, and were over the chambers and treasuries of the house of God.

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;