2 Kings 5:14-15

14So Naaman went down to the Jordan River. He washed himself in it seven times, as the man of God had told him to do. Naaman's skin became well again. It became as clean as a young child's skin.

15Then Naaman and all his servants went back to see Elisha, the man of God. Naaman stood in front of him and he said, ‘Now I know that there is no God in the whole world except the one in Israel. Please accept a gift from me, your servant.’