FARGARD X

I Purity is for man, next to life, the greatest of good ; that purity, O Zarathustra ! that is in the  ASHA of Mazda for him who cleans himself with good thoughts, words and deeds. 

II Make yourself pure, O follower of ASHA. Anyone in the world here below can win purity for himself by cleansing himself with good thoughts, words and deeds.