1 Chronicles 9:22-25

Altogether, those chosen to be gatekeepers at the thresholds numbered 212. They were registered by genealogy in their villages. The gatekeepers had been assigned to their positions of trust by David and Samuel the seer. They and their descendants were in charge of guarding the gates of the house of the LORD—the house called the tent of meeting. The gatekeepers were on the four sides: east, west, north and south. Their fellow Levites in their villages had to come from time to time and share their duties for seven-day periods.