The erection of the sacred ark on Zion, the foundation of a central point for the worship, certainly met the wishes of the priests. Only by a strictly-regulated and dominant mode of worship, by centralising the service, could the priests hope to bring into vogue the arrangement of ritual which they regarded as the true method appointed by God. Relying on the importance of such a central point, on the authority of the crown, they could expect obedience to their regulations. David on his part would hardly fail to see what weight the influence of an allied priesthood could add to the strength of the throne. What David did for Israel by the cultivation of religious song, by setting up the old national shrine in the new metropolis, by the dedication of it to be the abode of Jehovah has been of deep-reaching and even decisive influence for the fortunes of Israel and the course of her religious development. It is, of course, beyond doubt that only a few of the Psalms which David is said to have sung can with certainty be traced back to him; but from the fact that the greater part of these poems could be ascribed to him, it follows with the greater certainty that he must have given a powerful impulse to the religious poetry of Israel, that the words of thankfulness and trust in God from the lips of the victorious royal minstrel had the greatest influence on the Israelites. This influence connected with the exaltation and worship of the national sacred relic at Zion gave a new life and firmer root to the belief of the Israelites, both in the direction of religious feeling and religious prescriptions. When the chief place of sacrifice was marked out indubitably by the sacred ark on Zion, and members of the oldest priestly family officiated there, it was natural that by degrees a considerable number of priests should collect there, in order to share and co-operate in the worship in the sacred tent, in the tabernacle. These priests were arranged according to their families or "houses;" the greater number claimed Eleazar, the third son of Aaron, as their progenitor, while the less claimed to be descended from Ithamar, the fourth son of Aaron.[308] The eyes of the priesthood were already turned from Hebron to the early history of the nation, to the correct mode of worship, as Aaron and Moses had formerly proclaimed and practised it, which since the settlement in Canaan had become almost forgotten and obsolete with priests and laymen, since different customs had come into use at different places of sacrifice. The service at the new and yet ancient shrine at Jerusalem must support the impulse to practise, here at any rate, the old correct customs in perfect purity as a pattern and example, to insist on the custom of Zion as pleasing to God, and established by Moses, and to bring once more into authority and practice the true regulations of the sacrificial rites for the whole land. Agreement and union in the mode of worship would be most quickly and