He cleared away the various idol-worships which had taken root and flourished at different times on Jewish ground, and he thus acted according to the precepts contained in the Book of Deuteronomy. In the spring of the same year (621) Josiah summoned the entire nation to celebrate the feast of Passover in Jerusalem, according to the ordinances of the Law, and the nation willingly obeyed his mandate, having sworn to act according to the Law. This festival--celebrated for the first time by the mass of the nation--was rendered especially solemn by inspiring psalms, sung and accompanied by the Levites. One psalm, which was apparently sung on that occasion, has been preserved. The choir of Levitical singers exhorted the Aaronites to praise the God of Jacob, reminded them of the persecutions they had undergone, of the deliverance from Egypt, and of the revelation at Sinai, and also admonished them to keep away from strange gods. They alluded to the exile of a part of the nation, and prophesied happy days for those who observed the Sinaitic law. (Psalm lxxxi.) Josiah's energetic action against idolatry appeared so important an event to the faithful portion of the people that the prophets dated a new epoch from that time. The abominations of idolatry, with its terrible effects, which had so demoralised the nation for seven decades, had suddenly disappeared, owing to the zeal of the king. Social conditions were also improved. Josiah insisted on the enfranchisement of Hebrew slaves who had been six years in slavery, in accordance with the law which he had chosen as his guide. He also appointed unbiassed judges, who should secure justice to the poor and the helpless against the powerful. Historical accounts assert of Josiah that no king before him ever returned so sincerely to God, and carried out the law of Moses so strictly. In fact, Josiah appears also to have exerted himself energetically in political matters; he had the courage to assert his independence even against Egypt.