II Kings 5:10, 12-13

And Elisha sent a messenger to him, saying, “Go and wash in the Jordan seven times, and your flesh shall be restored to you, and you shall be clean.”

Are not the Abanah and the Pharpar, the rivers of Damascus, better than all the waters of Israel? Could I not wash in them and be clean?” So he turned and went away in a rage. And his servants came near and spoke to him, and said, “My father, if the prophet had told you to do something great, would you not have done it? How much more then, when he says to you, ‘Wash, and be clean’?”