'Porters' in the Bible

This is the thing that you shall do. A third part of you, who come in on the Sabbath, of the priests and of the Levites, shall be porters of the thresholds.

He set the porters at the gates of the house of Yahweh, that no one who was unclean in anything should enter in.

Also they were over the bearers of burdens, and set forward all who did the work in every kind of service: and of the Levites there were scribes, and officers, and porters.

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 were at every gate: they didn't need to depart from their service; for their brothers the Levites prepared for them.