2 Chronicles 35:2-6

2And he set the priests in their offices, and encouraged them to the service of the house of Jehovah. 3And he said unto the Levites that taught all Israel, that were holy unto Jehovah, Put the holy ark in the house which Solomon the son of David king of Israel did build; there shall no more be a burden upon your shoulders. Now serve Jehovah your God, and his people Israel; 4and prepare yourselves after your fathers’ houses by your courses, according to the writing of David king of Israel, and according to the writing of Solomon his son. 5And stand in the holy place according to the divisions of the fathers’ houses of your brethren the children of the people, and let there be for each a portion of a father’s house of the Levites. 6And kill the passover, and sanctify yourselves, and prepare for your brethren, to do according to the word of Jehovah by Moses.