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
وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ جَبَلَةَ، قَالَ سَمِعْتُ ابْنَ عُمَرَ، - رضى الله عنهما - يُحَدِّثُ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ " مَنْ كَانَ مُلْتَمِسَهَا فَلْيَلْتَمِسْهَا فِي الْعَشْرِ الأَوَاخِرِ " .
Ibn Umar (Allah be pleased with them) reported Allah's Messenger (ﷺ) as saying: He who is anxious to seek it (Lailat-ul-Qadr) should seek it in the last ten (nights of Ramadan).
Reference : Sahih Muslim 1165fIn-book reference : Book 13, Hadith 272USC-MSA web (English) reference : Book 6, Hadith 2622