1 Chronicles 9:22-24

22All these that were chosen to be porters in the thresholds were two hundred and twelve. These were reckoned by genealogy in their villages, whom David and Samuel the seer did ordain in their office of trust. 23So they and their children had the oversight of the gates of the house of Jehovah, even the house of the tent, by wards. 24On the four sides were the porters, toward the east, west, north, and south.