Udi or ash may be the purest material on earth possessing large powers of performing and undoing which is the result of sacrifices presented to fire (agni) which purifies all the things by destroying no matter what is evil. Accomplishing 'Yagha' (Dhuni) is considered the most pious ritual advisable https://atozbookmark.com/story13193224/the-ultimate-guide-to-sai-baba