1 Chronicles 9:21-23

And later Zechariah son of Meshelemiah was responsible for guarding the entrance to the Tabernacle. In all, there were 212 gatekeepers in those days, and they were listed according to the genealogies in their villages. David and Samuel the seer had appointed their ancestors because they were reliable men. These gatekeepers and their descendants, by their divisions, were responsible for guarding the entrance to the house of the LORD when that house was a tent.