1 Esdras 1:17LXX

15The holy singers also, the sons of Asaph, were in their order, according to the appointment of David, to wit, Asaph, Zacharias, and Jeduthun, who was of the king's retinue.

16Moreover the porters were at every gate; it was not lawful for any to go from his ordinary service: for their brethren the Levites prepared for them.

17Thus were the things that belonged to the sacrifices of the Lord accomplished in that day, that they might hold the passover,

18and offer sacrifices upon the altar of the Lord, according to the commandment of king Josias.

19So the children of Israel which were present held the passover at that time, and the feast of sweet bread seven days.