2 Kings 23:20

And he sacrificed all the priests of the high places who were there , on the altars , and burned human bones on them. Then he returned to Jerusalem .

Josiah slaughtered all the priests of those high places on the altars and burned human bones on them. Then he went back to Jerusalem.

And he slew all the priests of the high places that were there upon the altars, and burned men's bones upon them, and returned to Jerusalem.