The "inner part" means here, not the holy of holies in particular, but the interior generally. The priests alone might enter the temple building. The Levites might penetrate no further than the inner court.

And the priests went - The priests and Levites cleansed first the courts both of the priests and of the people. On this labor they spent eight days. Then they cleansed the interior of the temple; but as the Levites had no right to enter the temple, the priests carried all the dirt and rubbish to the porch, whence they were collected by the Levites, carried away, and cast into the brook Kidron; in this work eight days more were occupied, and thus the temple was purified in sixteen days.

And the priests went into the inner part of the house of the Lord, to cleanse it,.... Into the holy place, where the candlesticks and shewbread tables stood, into which none but priests might enter, but not into the most holy place, the innermost of all; for none but the high priest might go into that, and only on the day of atonement; though in case of necessity, as for repairs, others might go into it, and so perhaps now to cleanse it, if any pollution was there:

and brought out all the uncleanness that they found in the temple of the Lord into the court of the house of the Lord; into the court of the priests, where the Levites might be, and were:

and the Levites took it, to carry it out abroad into the brook Kidron; which ran through the valley of the son of Hinnom, into which all unclean things, and the filth of the temple and sacrifices, were usually carried and cast, see 2 Kings 18:12.

The priests went into the inner part of the house of the Lord (into the holy place, probably also into the most holy place) to cleanse it, and removed all the uncleanness which was there into the court, whence the Levites carried it out into the valley of the brook Kidron (חוּצה, out of the precincts of the temple). The Levites were forbidden by the law to enter the holy place, and this command was strictly observed. Of what nature the uncleannesses were which the priests found in the holy place (היכל) cannot be accurately ascertained. Owing to the prevalence of idolatry under Ahaz, vessels, e.g., sacrificial bowls, which were used in the worship, may have come into the holy place; and besides, all vessels of the holy place would require to be cleaned, and their filth removed. The closing of the temple doors (2 Chronicles 28:24) occurred only in the last year of Ahaz, while idolatry had been practised from the beginning of his reign. On the Kidron, see on 2 Kings 23:4.

And the priests went into the inner part of the house of the LORD, to {f} cleanse it, and brought out all the uncleanness that they found in the temple of the LORD into the court of the house of the LORD. And the Levites took it, to carry it out abroad into the brook Kidron.

(f) From the pollution and filth that Ahaz had brought in.

29:1-19 When Hezekiah came to the crown, he applied at once to work reform. Those who begin with God, begin at the right end of their work, and it will prosper accordingly. Those that turn their backs upon God's ordinances, may truly be said to forsake God himself. There are still such neglects, if the word be not duly read and opened, for that was signified by the lighting the lamps, and also if prayers and praise be not offered up, for that was signified by the burning incense. Neglect of God's worship was the cause of the calamities they had lain under. The Lord alone can prepare the heart of man for vital godliness: when much good is done in a little time, the glory must be ascribed to him; and all who love him or the souls of men, will rejoice therein. Let those that do good work, learn to do it well.