3. Ecclesiastical administration. The capture of Jerusalem and its erection into the capital of the kingdom made a great change in ecclesiastical arrangements. For some time before it would have been hard to tell where the ecclesiastical capital was to be found. Shiloh had been stripped of its glory when Ichabod received his name, and the Philistine armies destroyed the place. Nob had shared a similar fate at the hands of Saul. The old tabernacle erected by Moses in the wilderness was at Gibeon (1 Chron. xxi. 29), and remained there even after the removal of the ark to Zion (1 Kings iii. 4). At Hebron, too, there must have been a shrine while David reigned there. But from the time when David brought up the ark to Jerusalem, that city became the greatest centre of the national worship. There the services enjoined by the law of Moses were celebrated; it became the scene of the great festivals of Passover, Pentecost, and Tabernacles. We are told that the heads of the ecclesiastical department were Zadok the son of Ahitub and Ahimelech the son of Abiathar. These represented the elder and the younger branches of the priesthood. Zadok was the lineal descendant of Eleazar, Aaron's son (1 Chron. vi. 12), and was therefore the constitutional successor to the high-priesthood. Ahimelech the son of Abiathar represented the family of Eli, who seems to have been raised to the high-priesthood out of order, perhaps in consequence of the illness or incompetence of the legitimate high-priest. It is of some interest to note the fact that under David two men were at the head of the priesthood, much as it was in the days of our Lord, when Annas and Caiaphas are each called the high-priest. The ordinary priests were divided into four-and-twenty courses, and each course served in its turn for a limited period, an arrangement which still prevailed in the days of Zacharias, the father of John the Baptist. A systematic arrangement of the Levites was likewise made; some were allocated to the service of the Temple, some were porters, some were singers, and some were officers and judges. Of the six thousand who filled the last-named office, "chief fathers" as they were called, nearly a half were allocated among the tribes east of the Jordan, as being far from the centre, and more in need of oversight. It is probable that this large body of Levites were not limited to strictly judicial duties, but that they performed important functions in other respects, perhaps as teachers, physicians, and registrars. It is not said that Samuel's schools of the prophets received any special attention, but the deep interest that David must have taken in Samuel's work, and his early acquaintance with its effects, leave little room to doubt that these institutions were carefully fostered, and owed to David some share of the vitality which they continued to exhibit in the days of Elijah and Elisha. It is very probable that the prophets Gad and Nathan were connected with these institutions.