Volume 8 · Book 75 · Hadith 414
Narrated Abu Huraira: Allah's Apostle said, "Whoever says, 'Subhan Allah wa bihamdihi,' one hundred times a day, will be forgiven all his sins even if they were as much as the foam of the sea.
— Sahih Bukhari, Volume 8, Book 75: Invocations, Hadith #414