Charles Spurgeon Commentary 2 Chronicles 28:3

"Moreover he burnt incense in the valley of the son of Hinnom, and burnt his children in the fire, according to the abominations of the nations whom Jehovah cast out before the children of Israel." — 2 Chronicles 28:3 (ASV)

Moreover he burnt incense in the valley of the son of Hinnom, and burnt his children in the fire, after the abominations of the heathen whom the LORD had cast out before the children of Israel.

The worship of Moloch was one of the most horrible that can be imagined. A brazen image was made terribly hot, and then children were thrust into its burning arms to be consumed; and this king went to such a length that he gave his own children to death in that cruel fashion in the place commonly called by the Jews Topheth, or, the place of spitting, since it was so loathsome to them to think of this false God.