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 (PBUH) as saying: He who is anxious to seek it (Lailat-ul-Qadr) should seek it in the last ten (nights of Ramadan). Translation Not Available

Book Ref: Sahih Muslim Book 13 Hadith 2622
Web Ref:  Sahih Muslim Book 6 Hadith 1165 f