Hadithcore
Sahih Muslim, 762 b
sahih

Ubayy b Ka'b reported:

By Allah, I know about Lailat-ul Qadr and I know it fully well that it is the twenty-seventh night (during Ramadan) on which the Messenger of Allah (ﷺ) commanded us to observe prayer. (Shu'ba was in doubt about these words:" the night on which the Messenger of Allah [ﷺ] commanded us to observe the prayer." This has been transmitted to me by a friend of mine.)

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، قَالَ سَمِعْتُ عَبْدَةَ بْنَ أَبِي لُبَابَةَ، يُحَدِّثُ عَنْ زِرِّ بْنِ حُبَيْشٍ، عَنْ أُبَىِّ بْنِ كَعْبٍ، قَالَ أُبَىٌّ فِي لَيْلَةِ الْقَدْرِ وَاللَّهِ إِنِّي لأَعْلَمُهَا وَأَكْثَرُ عِلْمِي هِيَ اللَّيْلَةُ الَّتِي أَمَرَنَا رَسُولُ اللَّهِ صلى الله عليه وسلم بِقِيَامِهَا هِيَ لَيْلَةُ سَبْعٍ وَعِشْرِينَ - وَإِنَّمَا شَكَّ شُعْبَةُ فِي هَذَا الْحَرْفِ - هِيَ اللَّيْلَةُ الَّتِي أَمَرَنَا بِهَا رَسُولُ اللَّهِ صلى الله عليه وسلم ‏.‏ قَالَ وَحَدَّثَنِي بِهَا صَاحِبٌ لِي عَنْهُ ‏.‏

References2 variants
In-Book Reference
Book 6, Hadith 214
USC-MSA web (English) reference
Book 4, Hadith 1669 (deprecated numbering scheme)
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