2 Kings 5:13-14

But Naaman's officials went to him and said, “Sir, if the prophet had told you that you had to do something extraordinary, wouldn't you have done it? How much easier is it to do what he says, ‘Wash and you'll be healed’?” So Naaman went down and plunged himself underwater in the Jordan seven times, as the man of God had told him. His body was healed, his skin became like a baby's, and he was clean.