
Allah Ta'ala shall forgive all of his / her sins even if it is more than all the foam of the ocean. And whomsoever recites this daily, then indeed there is no deed more virtuous for that person on the forthcoming Day of Qiyamah, except for those who has recited as much as that person has, or has recited more than that person.
(Muslim, Tirmidhi & Nasa'i)