2 Chronicles 29:15-17

15They assembled their brothers and consecrated themselves. Then they went in to purify the Lord’s temple, just as the king had ordered, in accordance with the word of the Lord.

16The priests then entered the Lord’s temple to purify it; they brought out to the courtyard of the Lord’s temple every ceremonially unclean thing they discovered inside. The Levites took them out to the Kidron Valley.

17On the first day of the first month they began consecrating; by the eighth day of the month they reached the porch of the Lord’s temple. For eight more days they consecrated the Lord’s temple. On the sixteenth day of the first month they were finished.