TSK · 2 Kings 4:41

He went out to the spring of the waters, and threw salt into it, and said, "Thus says Yahweh, 'I have healed these waters. There shall not be from there any more death or miscarrying.'"

The man of God asked, "Where did it fall?" He showed him the place. He cut down a stick, threw it in there, and made the iron float.

However he shook off the creature into the fire, and wasn't harmed.