2 Chronicles 29:5

And said unto them, hear me, ye Levites; sanctify yourselves,
&c.] By washing their bodies and their garments, that no pollution might attend them in their service, see ( Isaiah 52:11 )

and sanctify the house of the Lord God of your fathers;
by carrying out of it all manner of uncleanness, as they did, ( 2 Chronicles 29:16 ) ,

and carry forth the filthiness out of the holy place;
or the abomination; the altar, like that at Damascus, which Ahaz, removing the altar of the Lord, had placed in the court of the priests; or, as Kimchi thinks, an idol, which he had set upon that altar.