Jamieson, Fausset and Brown on 2 Chronicles 25:14-16

14-16. 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. Whether he had been captivated with the beauty of the images, or hoped by honoring the gods to disarm their spite at him for his conquest and harsh treatment of their votaries, his conduct in establishing these objects of religious homage in Jerusalem was foolish, ignorant, and highly offensive to God, who commissioned a prophet to rebuke him for his apostasy, and threaten him with the calamity that soon after befell him.