Sahih Bukhari Volume 3, Book 32, Hadith 2024

حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، حَدَّثَنَا حُمَيْدٌ، حَدَّثَنَا أَنَسٌ، عَنْ عُبَادَةَ بْنِ الصَّامِتِ، قَالَ خَرَجَ النَّبِيُّ صلى الله عليه وسلم لِيُخْبِرَنَا بِلَيْلَةِ الْقَدْرِ، فَتَلاَحَى رَجُلاَنِ مِنَ الْمُسْلِمِينَ، فَقَالَ ‏"‏ خَرَجْتُ لأُخْبِرَكُمْ بِلَيْلَةِ الْقَدْرِ، فَتَلاَحَى فُلاَنٌ وَفُلاَنٌ، فَرُفِعَتْ، وَعَسَى أَنْ يَكُونَ خَيْرًا لَكُمْ، فَالْتَمِسُوهَا فِي التَّاسِعَةِ وَالسَّابِعَةِ وَالْخَامِسَةِ ‏"‏‏.‏

Narrated By 'Ubada bin As-Samit : The Prophet came out to inform us about the Night of Qadr but two Muslims were quarrelling with each other. So, the Prophet said, "I came out to inform you about the Night of Qadr but such-and-such persons were quarrelling, so the news about it had been taken away; yet that might be for your own good, so search for it on the 29th, 27th and 25th (of Ramadan).