2 Kings 5:14-17

So Naaman went down to the Jordan River and dipped himself seven times, as the man of God had instructed him. And his skin became as healthy as the skin of a young child, and he was healed! Then Naaman and his entire party went back to find the man of God. They stood before him, and Naaman said, “Now I know that there is no God in all the world except in Israel. So please accept a gift from your servant.” But Elisha replied, “As surely as the LORD lives, whom I serve, I will not accept any gifts.” And though Naaman urged him to take the gift, Elisha refused. Then Naaman said, “All right, but please allow me to load two of my mules with earth from this place, and I will take it back home with me. From now on I will never again offer burnt offerings or sacrifices to any other god except the LORD.