Sahih Muslim Book - 48, Hadith - 6842

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى ، قَالَ: قَرَأْتُ عَلَى مَالِكٍ ، عَنْ سُمَيٍّ ، عَنْ أَبِي صَالِحٍ ، عَنْ أَبِي هُرَيْرَةَ ، أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، قَالَ: مَنْ قَالَ: لاَ إِلَهَ إِلاَّ اللَّهُ وَحْدَهُ لاَ شَرِيكَ لَهُ ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ ، فِي يَوْمٍ مِئَةَ مَرَّةٍ ، كَانَتْ لَهُ عَدْلَ عَشْرِ رِقَابٍ ، وَكُتِبَتْ لَهُ مِئَةُ حَسَنَةٍ وَمُحِيَتْ عَنْهُ مِائَةُ سَيِّئَةٍ ، وَكَانَتْ لَهُ حِرْزًا مِنَ الشَّيْطَانِ ، يَوْمَهُ ذَلِكَ ، حَتَّى يُمْسِيَ وَلَمْ يَأْتِ أَحَدٌ أَفْضَلَ مِمَّا جَاءَ بِهِ إِلاَّ أَحَدٌ عَمِلَ أَكْثَرَ مِنْ ذَلِكَ ، وَمَنْ قَالَ : سُبْحَانَ اللهِ وَبِحَمْدِهِ ، فِي يَوْمٍ مِئَةَ مَرَّةٍ حُطَّتْ خَطَايَاهُ وَلَوْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ.

It was narrated from Abu Hurairah that the Messenger of Allah (s.a.w) said: "Whoever says: 'La ilaha illallahu wahdahu Ia sharika lahu, lahul-mulku wa lahul-hamdu, wa huwa 'ala kulli shay'in qadir (None has the right to be worshiped but Allah alone with no partner or associate, His is the dominion, to Him is praise and He has power over all things)' one hundred times in a day, it will be the equivalent of his freeing one hundred slaves, and one hundred good deeds will be recorded for him, and one hundred bad deeds will be erased for him, and it will be a protection for him against the Shaitan all day until evening comes, and no one will do anything better than what he has done except one who does more than that. And whoever says: 'Subhan Allahi wa bihamdihi (Glory and praise is to Allah)' one hundred times in a day, his sins will be erased, even if they are like the foam of the sea."