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 عُقْبَةَ، - وَهُوَ ابْنُ حُرَيْثٍ - قَالَ سَمِعْتُ ابْنَ عُمَرَ، - رضى الله عنهما - يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الْتَمِسُوهَا فِي الْعَشْرِ الأَوَاخِرِ - يَعْنِي لَيْلَةَ الْقَدْرِ - فَإِنْ ضَعُفَ أَحَدُكُمْ أَوْ عَجَزَ فَلاَ يُغْلَبَنَّ عَلَى السَّبْعِ الْبَوَاقِي " .
Ibn Umar (Allah be pleased with them) reported Allah's Messenger (ﷺ) as saying: Seek it (Lailat-ul-Qadr) in the last (ten nights). If one among you shows slackness and weakness (in the earlier part of Ramadan), it should not be allowed to prevail upon him in the last week.
Reference : Sahih Muslim 1165eIn-book reference : Book 13, Hadith 271USC-MSA web (English) reference : Book 6, Hadith 2621