Divrey Hayamim Bais 29:17

17 Now they began on the first day of the chodesh harishon to set apart as kodesh, and on the eighth day of the month they came to the Ulam Hashem; so they set apart as kodesh the Beis Hashem in eight days; and in the sixteenth day of the first month they finished.

Divrey Hayamim Bais 29:17 Meaning and Commentary

2 Chronicles 29:17

Now they began on the first day of the first month to
sanctify
Either of the reign of King Hezekiah, or rather of the year; the month Ab or Nisan, as the Targum expresses it: and on the eighth of the month came they to the porch of the Lord;
they seem to have begun cleansing the inner part of the temple first, and so came forward until they came to the porch which led into it: so they sanctified the house of the Lord in eight days;
the holy place, and it may be the most holy place, and the court of the priests: and on the sixteenth day of the first month they made an end;
it took them eight days more to cleanse the outward porch, and the buildings and chambers belonging to the temple; according to Jarchi, it required so much time, because Ahaz had framed pictures of idols upon the walls of the temple, which could not be defaced sooner.

Divrey Hayamim Bais 29:17 In-Context

15 And they gathered their achim, and set themselves apart as kodesh, and went in, according to the mitzvat HaMelech, by the words of Hashem, to make tahor the Beis Hashem.

16 And the Kohanim went into the penimah (inner part) Beis Hashem, to make it tahor, and brought out all tumah that they found in the Heikhal Hashem into the khatzer (courtyard) of the Beis Hashem. And the Levi’im took it, to carry it outside into the Wadi Kidron.

17 Now they began on the first day of the chodesh harishon to set apart as kodesh, and on the eighth day of the month they came to the Ulam Hashem; so they set apart as kodesh the Beis Hashem in eight days; and in the sixteenth day of the first month they finished.

18 Then they went penimah to Chizkiyah HaMelech, and said, We have made tahor all the Beis Hashem, and the Mizbe’ach HaOlah, with all the vessels thereof, and the Shulchan HaMa’arechet (Table of the Stacks of Showbread), with all the vessels thereof.

19 Moreover all the kelim (vessels), which HaMelech Achaz in his reign did remove in his unfaithfulness, have we prepared and set apart as kodesh, and, hinei, they are before the Mizbe’ach Hashem.