John Gills Exposition of the Bible Commentary

Verse 12 (2 Kings 23:12)

And the altars that were on the top of the upper chamber of Ahaz, which the kings of Judah had made ,.... Which were on the roof of the royal palace; the roofs of houses in Judah being flat, Deuteronomy 21:8 altars might be built upon them; so, in Arabia, altars were built on the tops of houses to offer incense thereon daily to the sun F16 Strabo, Geograph l. 16. p. 539. ; as here by Manasseh and Amon very probably, which might be chosen because nearer the heavens; for which reason the Heathens made use of high places to worship in, see Jeremiah 19:13 .

and the altars which Manasseh had made in the two courts of the house of the Lord ; 2 Kings 21:5 .

did the king beat down ; ordered to be demolished:

and brake them down from thence, and cast the dust of them into the brook Kidron ; that there might be no remains of them to be put to any superstitious use.

- John Gills Exposition of the Bible Commentary