وَحَدَّثَنِي زِيَادٌ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رِجَالاً، مِنْ أَصْحَابِ رَسُولِ اللَّهِ صلى الله عليه وسلم أُرُوا لَيْلَةَ الْقَدْرِ فِي الْمَنَامِ فِي السَّبْعِ الأَوَاخِرِ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنِّي أَرَى رُؤْيَاكُمْ قَدْ تَوَاطَأَتْ فِي السَّبْعِ الأَوَاخِرِ فَمَنْ كَانَ مُتَحَرِّيَهَا فَلْيَتَحَرَّهَا فِي السَّبْعِ الأَوَاخِرِ ‏"‏ ‏.‏

Ziyad related to me from Malik from Nafi from Ibn 'Umar thatsome of the companions of the Messenger of Allah, may Allah bless himand grant him peace, were shown Laylat al-Qadr in their sleep duringthe last seven days. The Messenger of Allah, may Allah bless him andgrant him peace, said, "I see that your visions agree about the lastseven days, so whoever is searching for it should do so in the lastseven days." Translation Not Available

Book Ref: Muwatta Imam Malik Book 19 Hadith 705
Web Ref:  Muwatta Imam Malik Book 19 Hadith 15