It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that he heard the Prophet (peace and blessings be upon him) say: "Whoever says 'Subhan Allahi wa bihamdih' (Glory be to Allah, and praise be to Him) one hundred times in the morning and in the evening, his sins are forgiven, even if they are more than the foam of the sea." This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs (Bukhari and Muslim) did not record it.