2 Chronicles 29:15-17

15When they had gathered their brothers and sanctified themselves, they went in, as the king ordered according to the words of Adonai, to cleanse the House of Adonai.

16So the kohanim went into the inner part of the House of Adonai to purify it. They brought out to the courtyard of the House of Adonai every impure thing that they found in the temple of Adonai. Then the Levites received it and carried it out to Kidron Valley.

17They began the consecration on the first day of the first month, and by the eighth day of the month they reached the porch of Adonai. For eight days they consecrated the House of Adonai and finished on the sixteenth day of the first month.