doorkeepers

"guards" or "gatekeepers"

Shallum ... Akkub ... Talmon ... Ahiman ... Kore ... Ebiasaph

"Levi's descendants guarded the king's gate on the east side of their camp"

These phrases both refer to the entrance of the tent of meeting, or the tabernacle.

This is a metonym for the second temple, which the people built after they returned from Babylon. (See: rc://en/ta/man/translate/figs-metonymy)