'Wash' in the Bible

Then Elisha sent him a messenger, who said, “Go wash seven times in the Jordan and your flesh will be restored and you will be clean.”

Aren’t Abana and 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 left in a rage.

But 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 should you do it when he tells you, ‘Wash and be clean’?”