Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever declares there is no god but Allah without any partner, to Him belongs sovereignty and praise and He is powerful over everything one hundred times a day, he will have the reward of emancipating ten slaves, a hundred good deeds will be recorded for him, a hundred sins will be erased from his record, and he will have a guard against Satan during the day until evening. No one will exceed him but one who recited these words more often.”
Source: Ṣaḥīḥ al-Bukhārī 3293, Ṣaḥīḥ Muslim 2691
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي هُرَيْرَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ مَنْ قَالَ لَا إِلَهَ إِلَّا اللهُ 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 أَفْضَلَ مِمَّا جَاءَ بِهِ إِلَّا أَحَدٌ عَمِلَ أَكْثَرَ مِنْ ذَلِكَ
3293 صحيح البخاري كتاب الدعوات باب فضل التهليل
2691 صحيح مسلم كتاب الذكر والدعاء والتوبة والاستغفار باب فضل التهليل والتسبيح والدعاء