2 Kings 23:16-20

And as Josiah turned, he saw the tombs across on the mount, and he sent and brought the bones out of the tombs and burned them upon the altar and defiled it, in fulfillment of the word of the Lord which the man of God prophesied, who predicted these things [about this altar, naming Josiah before he was born]. [I Kings 13:2-5.]

Josiah said, What is that monument I see? The men of the city told him, It is the tomb of the man of God who came from Judah and foretold these things that you have just done against the altar of Bethel.

He said, Let him alone; let no man move his bones. So they let his bones alone, with the bones of the prophet that came out of Samaria. [I Kings 13:31, 32.]

Also Josiah took away all the houses of the high places in the cities of Samaria which the kings of Israel had made, provoking the Lord to anger, and he did to them all that he had done in Bethel.

He slew all the priests of the high places that were there upon the altars and burned men's bones upon them [to defile the places forever]. Then he returned to Jerusalem.