23 They and their descendants were in charge of guarding the gates of the house of the LORD—the house called the tent of meeting.

Read 1 Chronicles 9:23 Using Other Translations

So they and their children had the oversight of the gates of the house of the LORD, namely, the house of the tabernacle, by wards.
So they and their sons were in charge of the gates of the house of the LORD, that is, the house of the tent, as guards.
These gatekeepers and their descendants, by their divisions, were responsible for guarding the entrance to the house of the LORD when that house was a tent.