3 He burned sacrifices in the Valley of Ben Hinnom and sacrificed his children in the fire, engaging in the detestable practices of the nations the LORD had driven out before the Israelites.

Read 2 Chronicles 28:3 Using Other Translations

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.
and he made offerings in the Valley of the Son of Hinnom and burned his sons as an offering, according to the abominations of the nations whom the LORD drove out before the people of Israel.
He offered sacrifices in the valley of Ben-Hinnom, even sacrificing his own sons in the fire. In this way, he followed the detestable practices of the pagan nations the LORD had driven from the land ahead of the Israelites.