When Amaziah returned from the slaughter of the Edomites, he brought back the gods of the Seirites, set them up as his own gods, bowed before them, and burned sacrifices to them.
Here is, I. The revolt of Amaziah from the God of Israel to the gods of the Edomites. Egregious folly! Ahaz worshipped the gods of those that had conquered him, for which he had some little colour, Ch2 28:23. But to worship the gods of those whom he had conquered, who could not protect their own worshippers, was the greatest absurdity that could be.
Commenting on 2 Chronicles 25:14-16
Wherefore the anger of the Lord was kindled against Amaziah,.... Idolatry being always highly displeasing to the Lord; and this was a most provoking instance of it, that when the Lord had given him victory over his enemies, that he should forsake him, and worship their gods: and he sent unto him a prophet; whether the same as before, is not certain: which said unto...
Amaziah . . . brought the gods of the children of Seir--The Edomites worshipped the sun under different forms and with various rites. But burning incense upon altars was a principal act of worship, and this was the very thing Amaziah is described as having with strange infatuation performed.