2 Chronicles 29:15-17

Young's Literal Translation

¹⁵ and they gather their brethren, and sanctify themselves, and come in, according to the command of the king in the matters of Jehovah, to cleanse the house of Jehovah,

¹⁶ and the priests come in to the inner part of the house of Jehovah to cleanse [it], and bring out all the uncleanness that they have found in the temple of Jehovah to the court of the house of Jehovah, and the Levites receive [it], to take [it] out to the brook Kidron without.

¹⁷ And they begin on the first of the first month to sanctify, and on the eighth day of the month they have come to the porch of Jehovah, and they sanctify the house of Jehovah in eight days, and on the sixteenth day of the first month they have finished.