2 Kings 5:13-14

But his servants approached and spoke to him, “My father, if the prophet had told you to do some great thing, would you not have done it? How much more when he said to you, ‘Wash and be clean’?” So he went down and dipped himself in the Jordan seven times, according to the word of the man of God, and his flesh returned like the flesh of a little boy, and he was clean.