2 Kings 5:14-15

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

15When he returned with his entire retinue to the man of God, and came and stood before him, he said, “Behold, now I know that there is no God in all the earth except in Israel. Now please, accept a present from your servant.”