'Gatekeepers' in the Bible

And he establisheth, according to the ordinance of David his father, the courses of the priests over their service, and of the Levites over their charges, to praise and to minister over-against the priests, according to the matter of a day in its day, and the gatekeepers in their courses at gate and gate, for so is the command of David the man of God.

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 he stationeth the gatekeepers over the gates of the house of Jehovah, and the unclean in anything doth not go in.

and over the burden-bearers, and overseers of every one doing work for service and service; and of the Levites are scribes, and officers, and gatekeepers.