حَدَّثَنَا مُحَمَّدُ بْنُ مِهْرَانَ الرَّازِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، حَدَّثَنَا الأَوْزَاعِيُّ، حَدَّثَنِي عَبْدَةُ، عَنْ زِرٍّ، قَالَ سَمِعْتُ أُبَىَّ بْنَ كَعْبٍ، يَقُولُ - وَقِيلَ لَهُ إِنَّ عَبْدَ اللَّهِ بْنَ مَسْعُودٍ يَقُولُ مَنْ قَامَ السَّنَةَ أَصَابَ لَيْلَةَ الْقَدْرِ - فَقَالَ أُبَىٌّ وَاللَّهِ الَّذِي لاَ إِلَهَ إِلاَّ هُوَ إِنَّهَا لَفِي رَمَضَانَ - يَحْلِفُ مَا يَسْتَثْنِي - وَوَاللَّهِ إِنِّي لأَعْلَمُ أَىُّ لَيْلَةٍ هِيَ ‏.‏ هِيَ اللَّيْلَةُ الَّتِي أَمَرَنَا بِهَا رَسُولُ اللَّهِ صلى الله عليه وسلم بِقِيَامِهَا هِيَ لَيْلَةُ صَبِيحَةِ سَبْعٍ وَعِشْرِينَ وَأَمَارَتُهَا أَنْ تَطْلُعَ الشَّمْسُ فِي صَبِيحَةِ يَوْمِهَا بَيْضَاءَ لاَ شُعَاعَ لَهَا ‏.‏

Zirr (b. Hubaish) reported:I heard from Ubayy b. Ka'b a statement made by 'Abdullah b. Mas'ud in which he said: He who gets up for prayer (every night) during the year will hit upon Lailat-ul-Qadr. Ubayy said: By Allah I there is no god but He, that (Lailat-ul-Qadr) is in Ramadhan (He swore without reservation: ) By Allah, I know the night; it is the night on which the Messenger of Allah (ﷺ) commanded us to pray. It is that which precedes the morning of twenty-seventy and its indication is that the sun rises bright on that day without rays