The Book of Fasting
13/40. Chapter:
The virtue of Lailat Al-Qadr and the Exhortation to seek it; When it is and the most likely times to seek it
Sahih Muslim
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ نُمَيْرٍ، وَوَكِيعٌ، عَنْ هِشَامٍ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم قَالَ ابْنُ نُمَيْرٍ " الْتَمِسُوا - وَقَالَ وَكِيعٌ - تَحَرَّوْا لَيْلَةَ الْقَدْرِ فِي الْعَشْرِ الأَوَاخِرِ مِنْ رَمَضَانَ " .
'A'isha (Allah be pleased with her) and Ibn Numair reported Allah's Messenger (ﷺ) as saying: Look for (and in the words of Waki, seek) Lailat-ul-Qadr in the last ten nights of Ramadan.
Reference : Sahih Muslim 1169In-book reference : Book 13, Hadith 282USC-MSA web (English) reference : Book 6, Hadith 2632