Hadithcore
Sahih Muslim, 596 a
sahih

Ka'b b. 'Ujra reported Allah's Messenger (ﷺ) as saying:

There are certain ejaculations, the repeaters of which or the performers of which after every prescribed prayer will never be caused disappointment:" Glory be to Allah" thirty-three times." Praise be to Allah" thirty-three times, and" Allah is most Great" thirty-four times.

وَحَدَّثَنَا الْحَسَنُ بْنُ عِيسَى، أَخْبَرَنَا ابْنُ الْمُبَارَكِ، أَخْبَرَنَا مَالِكُ بْنُ مِغْوَلٍ، قَالَ سَمِعْتُ الْحَكَمَ بْنَ عُتَيْبَةَ، يُحَدِّثُ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى، عَنْ كَعْبِ بْنِ عُجْرَةَ، عَنْ رَسُولِ اللَّهِ صلى الله عليه وسلم قَالَ ‏

‏ مُعَقِّبَاتٌ لاَ يَخِيبُ قَائِلُهُنَّ - أَوْ فَاعِلُهُنَّ - دُبُرَ كُلِّ صَلاَةٍ مَكْتُوبَةٍ ثَلاَثٌ وَثَلاَثُونَ تَسْبِيحَةً وَثَلاَثٌ وَثَلاَثُونَ تَحْمِيدَةً وَأَرْبَعٌ وَثَلاَثُونَ تَكْبِيرَةً ‏

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References2 variants
In-Book Reference
Book 5, Hadith 186
USC-MSA web (English) reference
Book 4, Hadith 1241 (deprecated numbering scheme)
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