2 Kings 5:14-15

14So Naaman went down and dipped himself in the Jordan seven times, according to the word of the man of God, and his flesh was restored and became like that of a little child, and he was clean.

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