Umm Sulaim came upon the Prophet and said: "Teach me some words that I can say in my Salat." So he said: "Mention Allah's Greatness (saying: Allahu Akbar) ten times, mention Allah's Glory (saying: Subhan Allah) ten times, and mention Allah's praise (saying: Al-Hamdulilah) ten times. Then ask as you like, (for which) He says: 'Yes. Yes.'"  

أَنَّ أُمَّ سُلَيْمٍ غَدَتْ عَلَى النَّبِيِّ ﷺ فَقَالَتْ عَلِّمْنِي كَلِمَاتٍ أَقُولُهُنَّ فِي صَلاَتِي فَقَالَ كَبِّرِي اللَّهَ عَشْرًا وَسَبِّحِي اللَّهَ عَشْرًا وَاحْمَدِيهِ عَشْرًا ثُمَّ سَلِي مَا شِئْتِ يَقُولُ نَعَمْ نَعَمْ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عَبَّاسٍ وَعَبْدِ اللَّهِ بْنِ عَمْرٍو وَالْفَضْلِ بْنِ عَبَّاسٍ وَأَبِي رَافِعٍ  

Messenger of Allah said to Al-Abbas: "O uncle! Shall I not give to you, shall I not present to you, shall I not benefit you?" He said: "Of course, O Messenger of Allah!" He said: "O uncle! Pray four Rak'ah, reciting in each Rak'ah Fatihatil-Kitab and a Surah. When you are finished your recitation then say: Allahu Akbar, wal-hamdulilah, wa Subhan-Allah, [Wa La Ilaha illallah] 'Allah is Greatest, and all praise is due to Allah, and Glorious is Allah, [and there is none worthy of worship except Allah].' fifteen times before you bow. Then bow and say it ten times, then raise your head and say it ten times. Then prostrate [the second time] and say it ten times. Then raise your head and say it ten times before standing. That is seventy-five in every Rak'ah, which is three-hundred in four Rak'ah. If your sins were like a heap of sand then Allah would forgive you." He said: "O Messenger if Allah! Who is able to say that every day?" He said: "If you can not say it every day then say it every Friday, and if you are not able to say it every Friday then say it every month." And he did not stop saying that until he said: "Then say it every year."  

قَالَ رَسُولُ اللَّهِ ﷺ لِلْعَبَّاسِ يَا عَمِّ أَلاَ أَصِلُكَ أَلاَ أَحْبُوكَ أَلاَ أَنْفَعُكَ قَالَ بَلَى يَا رَسُولَ اللَّهِ قَالَ يَا عَمِّ صَلِّ أَرْبَعَ رَكَعَاتٍ تَقْرَأُ فِي كُلِّ رَكْعَةٍ بِفَاتِحَةِ الْكِتَابِ وَسُورَةٍ فَإِذَا انْقَضَتِ الْقِرَاءَةُ فَقُلِ اللَّهُ أَكْبَرُ وَالْحَمْدُ لِلَّهِ وَسُبْحَانَ اللَّهِ وَلاَ إِلَهَ إِلاَّ اللَّهُ خَمْسَ عَشْرَةَ مَرَّةً قَبْلَ أَنْ تَرْكَعَ ثُمَّ ارْكَعْ فَقُلْهَا عَشْرًا ثُمَّ ارْفَعْ رَأْسَكَ فَقُلْهَا عَشْرًا ثُمَّ اسْجُدْ فَقُلْهَا عَشْرًا ثُمَّ ارْفَعْ رَأْسَكَ فَقُلْهَا عَشْرًا ثُمَّ اسْجُدِ الثَّانِيَةَ فَقُلْهَا عَشْرًا ثُمَّ ارْفَعْ رَأْسَكَ فَقُلْهَا عَشْرًا قَبْلَ أَنْ تَقُومَ فَتِلْكَ خَمْسٌ وَسَبْعُونَ فِي كُلِّ رَكْعَةٍ وَهِيَ ثَلاَثُمِائَةٍ فِي أَرْبَعِ رَكَعَاتٍ فَلَوْ كَانَتْ ذُنُوبُكَ مِثْلَ رَمْلِ عَالِجٍ لَغَفَرَهَا اللَّهُ لَكَ قَالَ يَا رَسُولَ اللَّهِ وَمَنْ يَسْتَطِيعُ أَنْ يَقُولَهَا فِي كُلِّ يَوْمٍ قَالَ فَإِنْ لَمْ تَسْتَطِعْ أَنْ تَقُولَهَا فِي كُلِّ يَوْمٍ فَقُلْهَا فِي جُمُعَةٍ فَإِنْ لَمْ تَسْتَطِعْ أَنْ تَقُولَهَا فِي جُمُعَةٍ فَقُلْهَا فِي شَهْرٍ فَلَمْ يَزَلْ يَقُولُ لَهُ حَتَّى قَالَ فَقُلْهَا فِي سَنَةٍ