2 Chronicles 29:15-17

15These men called together their fellow Levites, and they all purified themselves. Then they began to cleanse the Temple of the Lord, just as the king had commanded. They were careful to follow all the Lord’s instructions in their work.

16The priests went into the sanctuary of the Temple of the Lord to cleanse it, and they took out to the Temple courtyard all the defiled things they found. From there the Levites carted it all out to the Kidron Valley.

17They began the work in early spring, on the first day of the new year, and in eight days they had reached the entry room of the Lord’s Temple. Then they purified the Temple of the Lord itself, which took another eight days. So the entire task was completed in sixteen days.