2 Kings 5:14-17

So 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. Then 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.” But Elisha said, “As the LORD lives, before whom I stand, I will accept nothing.” He urged him to take it, but Elisha refused. Naaman said, “If not, then please, let your servant be given a load of earth for a team of mules; for [from this day on] your servant will no longer offer a burnt offering nor a sacrifice to other gods, but only to the LORD, [the God of Israel].