'Door keepers' in the Bible

And he appointed, according to the ordinance of David his father, the divisions of the priests for their service, and the Levites for their charges, to praise and serve before the priests, as the duty of every day required; and the doorkeepers by their divisions at every gate: for such was the commandment of David the man of God;

And he set the doorkeepers at the gates of the house of Jehovah, that no one unclean in anything should enter in.

They were also over the bearers of burdens, and were overseers of all that worked in any manner of service. And of the Levites were the scribes, and officers, and doorkeepers.

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 doorkeepers were at every gate; they had not to depart from their service, for their brethren the Levites prepared for them.