وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي عُبَيْدٍ، مَوْلَى سُلَيْمَانَ بْنِ عَبْدِ الْمَلِكِ عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ أَبِي هُرَيْرَةَ، أَنَّهُ قَالَ مَنْ سَبَّحَ دُبُرَ كُلِّ صَلاَةٍ ثَلاَثًا وَثَلاَثِينَ وَكَبَّرَ ثَلاَثًا وَثَلاَثِينَ وَحَمِدَ ثَلاَثًا وَثَلاَثِينَ وَخَتَمَ الْمِائَةَ بِلاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَىْءٍ قَدِيرٌ غُفِرَتْ ذُنُوبُهُ وَلَوْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ ‏"‏ ‏.‏

Yahya related to me from Malik from Abu Ubayd, the mawla ofSulayman ibn Abd al-Malik, from Ata ibn Yazid al-Laythi that AbuHurayra said, "Whoever says 'Glory be to Allah' (Subhana'llah) thirty-three times and 'Allah is Greater' (Allahu akbar) thirty-three timesand 'Praise be to Allah' (al-hamdu lillah) thirty-three times, andseals the hundred with 'There is no god but Allah, alone without anypartner. The Kingdom and praise belong to Him and He has power overeverything' (La ilaha illa'llah, wahdahu la sharika lah, lahu'l mulkuwa lahu'l hamd, wa huwa ala kulli shay'in qadir) after every prayerwill have his wrong actions forgiven him even if they are abundant asthe foam on the sea." Translation Not Available

Book Ref: Muwatta Imam Malik Book 15 Hadith 494
Web Ref:  Muwatta Imam Malik Book 15 Hadith 22