2 Kings 5:14-17

14So he went down and dipped himself in the Jordan seven times, as the man of God had told him, and his flesh was restored and became clean like that of a young boy.

15Then Naaman and all his attendants went back to the man of God. He stood before him and said, “Now I know that there is no God in all the world except in Israel. So please accept a gift from your servant.”

16The prophet answered, “As surely as the LORD lives, whom I serve, I will not accept a thing.” And even though Naaman urged him, he refused. 17“If you will not,” said Naaman, “please let me, your servant, be given as much earth as a pair of mules can carry, for your servant will never again make burnt offerings and sacrifices to any other god but the LORD .