1 Chronicles 9:21-23

Zechariah the son of Meshelemiah was gatekeeper at the entrance of the tent of meeting. All these, who were chosen as gatekeepers at the thresholds, were 212. They were enrolled by genealogies in their villages. David and Samuel the seer established them in their office of trust. 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.