2 Kings 5:14-17

14Then went he down, and dipped himself seven times in Jordan, according to the saying of the man of God: and his flesh came again like unto the flesh of a little child, and he was clean.

15And he returned to the man of God, he and all his company, and came, and stood before him: and he said, Behold, now I know that there is no God in all the earth, but in Israel: now therefore, I pray thee, take a blessing of thy servant. 16But he said, As the Lord liveth, before whom I stand, I will receive none. And he urged him to take it; but he refused. 17And Naaman said, Shall there not then, I pray thee, be given to thy servant two mules’ burden of earth? for thy servant will henceforth offer neither burnt offering nor sacrifice unto other gods, but unto the Lord.