Mishkat al-Masabih
Mishkat al-Masabih 2302
وَعَنْ أَبِي هُرَيْرَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عَلَيْهِ وَسلم: " من قَالَ: لَا إِلَهَ إِلَّا اللَّهُ وَحْدَهُ لَا شَرِيكَ لَهُ لَهُ الْمُلْكُ وَلَهُ الْحَمْدُ وَهُوَ عَلَى كُلِّ شَيْءٍ قَدِيرٌ فِي يَوْمٍ مِائَةَ مَرَّةٍ كَانَتْ لَهُ عَدْلَ عَشْرِ رِقَابٍ وَكُتِبَتْ لَهُ مِائَةُ حَسَنَةٍ وَمُحِيَتْ عَنْهُ مِائَةُ سَيِّئَةٍ وَكَانَتْ لَهُ حِرْزًا مِنَ الشَّيْطَانِ يَوْمَهُ ذَلِكَ حَتَّى يُمْسِيَ وَلَمْ يَأْتِ أَحَدٌ بِأَفْضَلَ مِمَّا جَاءَ بِهِ إِلَّا رَجُلٌ عَمِلَ أَكْثَرَ مِنْهُ "
Abu Hurayrah reported that the Messenger of God (peace be upon him) said: ‘Whoever says “There is no deity but God alone, with no partner; to Him belongs dominion and praise, and He is powerful over all things” one hundred times in a day will have the reward of freeing ten slaves, one hundred good deeds recorded for him, and one hundred sins erased. It will be a protection for him from Satan that day until evening, and no one will bring anything better than what he has brought, except someone who does more.’ Agreed upon. The Arabic source records it as agreed upon (al-Albani).