Filthiness — That filthy altar, which Ahaz had put in the place of God's altar, 2 Kings 16:11, and the idols, or other abominable things which were there.
Related Commentaries of 2 Chronicles 29:5
2 Chronicles 29:5
5 And said unto them, Hear me, ye Levites, sanctify now yourselves, and sanctify the house of the LORD God of your fathers, and carry forth the filthiness out of the holy place.