2 Kings 5:14-15

14So he went to dip himself in the Jordan River seven times, as the man of God had instructed him. His skin became healthy again like a little child’s skin.

15Then he and all his men returned to the man of God. Naaman stood in front of Elisha and said, “Now I know that there’s no god in the whole world, except the God of Israel. So please accept a present from me.”