Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah (PBUH) said, "He who utters: `Subhan-Allahi wa bihamdihi (Allah is free from imperfection and His is the praise)' one hundred times a day, his sins will be obliterated even if they are equal to the extent of the foam of the ocean.'' [Al-Bukhari and Muslim].