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كتاب المناقب
61
Virtues and Merits of the Prophet (pbuh) and his Companions
(28)
Chapter
(28)
باب
Sahih al-Bukhari 3647

Narrated Anas bin Malik:

Allah's Messenger (ﷺ) reached Khaibar in the early morning and the people of Khaibar came out with their spades, and when they saw the Prophet (ﷺ) they said, "Muhammad and his army!" and returned hurriedly to take refuge in the fort. The Prophet (ﷺ) raised his hands and said, "Allah is Greater! Khaibar is ruined ! If we approach a nation, then miserable is the morning of those who are warned."

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا أَيُّوبُ، عَنْ مُحَمَّدٍ، سَمِعْتُ أَنَسَ بْنَ مَالِكٍ ـ رضى الله عنه ـ يَقُولُ صَبَّحَ رَسُولُ اللَّهِ صلى الله عليه وسلم خَيْبَرَ بُكْرَةً وَقَدْ خَرَجُوا بِالْمَسَاحِي، فَلَمَّا رَأَوْهُ قَالُوا مُحَمَّدٌ وَالْخَمِيسُ‏.‏ وَأَحَالُوا إِلَى الْحِصْنِ يَسْعَوْنَ، فَرَفَعَ النَّبِيُّ صلى الله عليه وسلم يَدَيْهِ وَقَالَ ‏ "‏ اللَّهُ أَكْبَرُ، خَرِبَتْ خَيْبَرُ، إِنَّا إِذَا نَزَلْنَا بِسَاحَةِ قَوْمٍ فَسَاءَ صَبَاحُ الْمُنْذَرِينَ ‏"‏‏.‏
Reference : Sahih al-Bukhari 3647
In-book reference : Book 61, Hadith 150
USC-MSA web (English) reference : Vol. 4, Book 56, Hadith 840
  (deprecated numbering scheme)