Hadithcore
Sahih al-Bukhari, 6403
sahih

Narrated Abu Huraira:

Allah's Messenger (ﷺ) said," Whoever says: "La ilaha illal-lah wahdahu la sharika lahu, lahu-l-mulk wa lahul- hamd wa huwa 'ala kulli shai'in qadir," one hundred times will get the same reward as given for manumitting ten slaves; and one hundred good deeds will be written in his accounts, and one hundred sins will be deducted from his accounts, and it (his saying) will be a shield for him from Satan on that day till night, and nobody will be able to do a better deed except the one who does more than he."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ سُمَىٍّ، عَنْ أَبِي صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏

‏ مَنْ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ، وَحْدَهُ لاَ شَرِيكَ لَهُ، لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ، وَهْوَ عَلَى كُلِّ شَىْءٍ قَدِيرٌ‏.‏ فِي يَوْمٍ مِائَةَ مَرَّةٍ، كَانَتْ لَهُ عَدْلَ عَشْرِ رِقَابٍ، وَكُتِبَ لَهُ مِائَةُ حَسَنَةٍ، وَمُحِيَتْ عَنْهُ مِائَةُ سَيِّئَةٍ، وَكَانَتْ لَهُ حِرْزًا مِنَ الشَّيْطَانِ يَوْمَهُ ذَلِكَ، حَتَّى يُمْسِيَ، وَلَمْ يَأْتِ أَحَدٌ بِأَفْضَلَ مِمَّا جَاءَ بِهِ إِلاَّ رَجُلٌ عَمِلَ أَكْثَرَ مِنْهُ ‏

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References2 variants
In-Book Reference
Book 80, Hadith 98
USC-MSA web (English) reference
Vol. 8, Book 75, Hadith 412 (deprecated numbering scheme)
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