2 Chronicles 29:15-17
[15]And they gathered their brethren, and sanctified themselves, and came, according to the commandment of the king, by the words of YAHUAH, to cleanse the house of YAHUAH.
[16]And the priests went into the inner part of the house of YAHUAH, to cleanse it, and brought out all the uncleanness that they found in the temple of YAHUAH into the court of the house of YAHUAH. And the Levites took it, to carry it out abroad into the brook Kidron.
[17]Now they began on the first day of the first month to sanctify, and on the eighth day of the month came they to the porch of YAHUAH: so they sanctified the house of YAHUAH in eight days; and in the sixteenth day of the first month they made an end.