1 Chronicles 9:22-25

All those chosen to be gatekeepers at the thresholds were 212. They were enrolled by their genealogies in their villages [around Jerusalem], these men [whose grandfathers] David and Samuel the seer had appointed to their official duty. So they and their sons were in charge of the gates of the house of the LORD, that is, the house of the tabernacle, as guards. The gatekeepers were stationed on the four sides —on the east, west, north, and south. Their relatives in their villages were to come in every seven days from time to time to be with them