Hazrat Abu Huraira (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: Whoever recites this supplication one hundred times during the day — "There is no deity except Allah, alone, He has no partner, His is the dominion and all praise is for Him, and He is powerful over everything" — he will receive a reward equal to freeing ten slaves. One hundred good deeds will be written in his record, and one hundred sins will be erased from him. This supplication will protect him from Satan throughout the day until evening comes, and no one will come with a better deed than this, except for someone who recites this phrase even more than that.
Hadith Takhrij«صحیح، أخرجه البخاري في: 59 كتاب بدء الخلق: 11 باب صفة إبليس وجنوده»
Hadith 1725
1725 صحيح حديث أَبِي هُرَيْرَةَ رضي الله عنه أَنَّ رَسُولَ اللهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ، قَالَ: مَنْ قَالَ سُبْحَانَ اللهِ وَبِحَمْدِهِ، فِي يَوْمٍ مَائَةَ مَرَّةٍ، حَطَّتْ خَطَايَاهُ، وَإِنْ كَانَتْ مِثْلَ زَبَدِ الْبَحْرِ
Hazrat Abu Huraira (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: Whoever says "Subhan Allah wa bihamdihi" one hundred times a day, his sins will be forgiven, even if they are as much as the foam of the sea.
Hazrat Abu Ayyub Ansari (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings of Allah be upon him) said: Whoever recites this phrase — "There is no deity except Allah, He is alone, He has no partner, to Him belongs the dominion and to Him belongs all praise, and He has power over all things" — ten times, it will be as if he has freed one (Arab slave) from among the descendants of Ismail.
Hazrat Abu Huraira (may Allah be pleased with him) narrated that the Noble Prophet (peace and blessings of Allah be upon him) said: "Two phrases which are light on the tongue but very heavy on the scale and beloved to the Most Merciful: Subhan Allah al-Azeem, Subhan Allah wa bihamdihi."