[Machine] The Messenger of Allah, ﷺ , said, "Much goodness for the one who knows it, little [but] follows it after every obligatory prayer: ten takbirs, ten tasbeehs, and ten tahmeeds. That is one hundred and fifty [recitations] on the tongue, and one thousand and five hundred [recitations] in the scale. When he lays on his side, he glorifies Allah thirty-three times, praises Allah thirty-three times, and magnifies Allah thirty-four times. That is one hundred [recitations] on the tongue, and one thousand [recitations] in the scale. So which of you does actions equal to two thousand and five hundred bad deeds in the day and night?"  

قَالَ رَسُولُ اللهِ ﷺ «خَيْرٌ كَثِيرٌ مَنْ يَعْلَمُهُ قَلِيلٌ دُبُرَ كُلِّ صَلَاةٍ مَكْتُوبَةٍ عَشْرَ تَكْبِيرَاتٍ وَعَشْرَ تَسْبِيحَاتٍ وَعَشْرَ تَحْمِيدَاتٍ فَذَلِكَ مِائَةٌ وَخَمْسُونَ بِاللِّسَانِ وَأَلْفٌ وَخَمْسُمِائَةٍ فِي الْمِيزَانِ وَإِذَا وَضَعَ جَنْبَهُ سَبَّحَ اللهَ ثَلَاثًا وَثَلَاثِينَ وَحَمِدَ اللهَ ثَلَاثًا وَثَلَاثِينَ وَكَبَّرَ اللهَ أَرْبَعًا وَثَلَاثِينَ فَذَلِكَ مِائَةٌ بِاللِّسَانِ وَأَلْفٌ فِي الْمِيزَانِ فَأَيُّكُمْ يَعْمَلُ فِي الْيَوْمِ وَاللَّيْلَةِ أَلْفَيْنِ وَخَمْسَمِائَةِ سَيِّئَةٍ؟»  

[Machine] Fatimah, the daughter of the Prophet, came to the Prophet to ask him to provide her with a servant. The Prophet asked her, "Shall I not direct you to what is better for you than that?" She asked, "What is it?" He replied, "You should say SubhanAllah (Glory be to Allah) thirty-three times, and say Alhamdulillah (Praise be to Allah) thirty-three times, and say Allahu Akbar (Allah is the Greatest) thirty-four times before going to sleep." Sufyan said, "I do not know which of the thirty-four is is." Ali said, "I have not left it since I heard it from the Messenger of Allah ﷺ." It was asked, "Not even on the night of Saffayn?" He said, "Not even on the night of Saffayn."  

أَنَّ فَاطِمَةَ ابْنَةَ النَّبِيِّ ﷺ أَتَتِ النَّبِيَّ ﷺ تَسْتَخْدِمُهُ خَادِمًا فَقَالَ النَّبِيُّ ﷺ «أَلَا أَدُلُّكِ عَلَى مَا هُوَ خَيْرٌ لَكِ مِنْهُ؟» قَالَتْ وَمَا هُوَ؟ قَالَ «تُسَبِّحِينَ اللهَ عِنْدَ مَنَامِكِ ثَلَاثًا وَثَلَاثِينَ وَتُكَبِّرِينَ ثَلَاثًا وَثَلَاثِينَ وَتَحْمَدِينَ أَرْبَعًا وَثَلَاثِينَ» قَالَ سُفْيَانُ لَا أَدْرِي أَيُّهَا أَرْبَعٌ وَثَلَاثُونَ قَالَ عَلِيٌّ فَمَا تَرَكْتُهَا مُنْذُ سَمِعْتُهَا مِنْ رَسُولِ اللهِ ﷺ قِيلَ وَلَا لَيْلَةَ صَفَّيْنَ؟ قَالَ وَلَا لَيْلَةَ صَفَّيْنَ  

The Messenger of Allah ﷺ came to us one night and put his foot between me and Fatimah, and he taught us what to say when we went to bed. Thirty-three tasbeehah, thirty-three tahmeedah and thirty-four takbeerah. ʿAli ؓ said: I never omitted it after that. A man said to him: Not even on the night of Siffeen? said: Not even on the night of Siffeen. (Using translation from Aḥmad 1229)  

أَتَى رَسُولُ اللهِ ﷺ حَتَّى وَضَعَ قَدَمَهُ بَيْنِي وَبَيْنَ فَاطِمَةَ فَعَلَّمَنَا مَا نَقُولُ إِذَا أَخَذْنَا مَضَاجِعَنَا «ثَلَاثًا وَثَلَاثِينَ تَسْبِيحَةً وَثَلَاثًا وَثَلَاثِينَ تَحْمِيدَةً وَأَرْبَعًا وَثَلَاثِينَ تَكْبِيرَةً» قَالَ عَلِيٌّ فَمَا تَرَكْتُهَا بَعْدُ قَالَ لَهُ رَجُلٌ وَلَا لَيْلَةَ صَفَّيْنَ؟ قَالَ وَلَا لَيْلَةَ صَفَّيْنَ