2 Kings 5:13-14

13Then his servants approached and said to him, “My father, if the prophet had told you to do some great thing, would you not have done it? How much more then, when he has said to you, ‘Wash, and be clean?’ ”

14So he went down and plunged himself into the Jordan seven times, just as the man of God had said; and his flesh was restored like that of a little child and he was clean.