18 Who hitherto waited in the king's gate eastward: they were porters in the companies of the children of Levi.
English Standard Version
18 until then they were in the king's gate on the east side as the gatekeepers of the camps of the Levites.
18 and up to now the security guard at the King's Gate on the east. They also served as security guards at the camps of Levite families.
New King James Version
18 Until then they had been gatekeepers for the camps of the children of Levi at the King's Gate on the east.
New Living Translation
18 Prior to this time, they were responsible for the King's Gate on the east side. These men served as gatekeepers for the camps of the Levites.
Matthew Henry's Commentary on 1 Chronicles 9:18
This chapter expresses that one end of recording all these genealogies was, to direct the Jews, when they returned out of captivity, with whom to unite, and where to reside. Here is an account of the good state into which the affairs of religion were put, on the return from Babylon. Every one knew his charge. Work is likely to be done well when every one knows the duty of his place, and makes a business of it. God is the God of order. Thus was the temple a figure of the heavenly one, where they rest not day nor night from praising God, Revelation 4:8. Blessed be His name, believers there shall, not in turn, but all together, without interruption, praise him night and day: may the Lord make each of us fit for the inheritance of the saints in light.