2 Kings 5:14-15

14So he went down and plunged himself into the Jordan seven times, just as the man of God had said; and his flesh was restored like that of a little child and he was clean.

15Then Naaman returned to the man of God, he and all the people in his group, and stood before him. He said, “Behold, I know that there is no God in all the earth, except in Israel; so now accept a blessing and gift from your servant.”