John Gills Exposition of the Bible Commentary - 2 Chronicles 33:15
And he took away the strange gods, and the idol out of the house of the Lord ,.... Which he had set there, 2 Chronicles 33:7 . and all the altars that he had built in the mount of the house of the Lord, and in Jerusalem ; see 2 Chronicles 33:4 , and cast them out of the city ; perhaps into the brook Kidron; all this he did to show the sincerity of his repentance for his idolatry, and his abhorrence of it. read more
Matthew Henry's Complete Commentary - 2 Chronicles 33:11-20
We have seen Manasseh by his wickedness undoing the good that his father had done; here we have him by repentance undoing the evil that he himself had done. It is strange that this was not so much as mentioned in the book of Kings, nor does any thing appear there to the contrary but that he persisted and perished in his son. But perhaps the reason was because the design of that history was to show the wickedness of the nation which brought destruction upon them; and this repentance of Manasseh... read more