وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ سُمَىٍّ، مَوْلَى أَبِي بَكْرٍ عَنْ أَبِي صَالِحٍ السَّمَّانِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ مَنْ قَالَ سُبْحَانَ اللَّهِ وَبِحَمْدِهِ فِي يَوْمٍ مِائَةَ مَرَّةٍ حُطَّتْ عَنْهُ خَطَايَاهُ وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ ‏"‏ ‏.‏

Yahya related to me from Malik from Sumayy, the mawla of AbuBakr, from Abu Salih as-Samman from Abu Hurayra that the Messenger ofAllah, may Allah bless him and grant him peace, said, "Whoever says,'Glory be to Allah and with His praise' (Subhana'llah wa bi-hamdihi)one hundred times in a day will have his wrong actions taken away fromhim, even if they are as abundant as the foam on the sea." Translation Not Available

Book Ref: Muwatta Imam Malik Book 15 Hadith 493
Web Ref:  Muwatta Imam Malik Book 15 Hadith 21