Thematic Bible: Their posts were determined by lot

These likewise cast lots even as their brothers the sons of Aaron in the presence of David the king, and Zadok, and Ahimelech, and the heads of the fathers' [houses] of the priests and of the Levites; the fathers' [houses] of the chief even as those of his younger brother.

They cast lots, the small as well as the great, according to their fathers' houses, for every gate. The lot eastward fell to Shelemiah. Then for Zechariah his son, a wise counselor, they cast lots; and his lot came out northward. To Obed-Edom southward; and to his sons the storehouse. read more.
To Shuppim and Hosah westward, by the gate of Shallecheth, at the causeway that goes up, watch against watch. Eastward were six Levites, northward four a day, southward four a day, and for the storehouse two and two. For Parbar westward, four at the causeway, and two at Parbar. These were the divisions of the doorkeepers; of the sons of the Korahites, and of the sons of Merari.