Then as Josiah was looking around, he noticed several tombs in the side of the hill. He ordered that the bones be brought out, and he burned them on the altar at Bethel to desecrate it. This happened just as the LORD had promised through the man of God as Jeroboam stood beside the altar at the festival. Then Josiah turned and looked up at the tomb of the man of God who had predicted these things.
References for 2 Kings 23:16
"What is that monument over there?" Josiah asked.And the people of the town told him, "It is the tomb of the man of God who came from Judah and predicted the very things that you have just done to the altar at Bethel!"
Josiah replied, "Leave it alone. Don't disturb his bones." So they did not burn his bones or those of the old prophet from Samaria.