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كتاب الجهاد والسير
56  
Fighting for the Cause of Allah (Jihaad)
(116)
Chapter: The setting out of the Imam, before the people at the time of fright
(116)
باب مُبَادَرَةِ الإِمَامِ عِنْدَ الْفَزَعِ
Sahih al-Bukhari 2968

Narrated Anas bin Malik:

Once there was a feeling of fright at Medina, so Allah's Messenger (ﷺ) rode a horse belonging to Abu Talha and (on his return) he said, "We have not seen anything (fearful), but we found this horse very fast."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ شُعْبَةَ، حَدَّثَنِي قَتَادَةُ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ كَانَ بِالْمَدِينَةِ فَزَعٌ، فَرَكِبَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَرَسًا لأَبِي طَلْحَةَ، فَقَالَ ‏ "‏ مَا رَأَيْنَا مِنْ شَىْءٍ، وَإِنْ وَجَدْنَاهُ لَبَحْرًا ‏"‏‏.‏
Reference : Sahih al-Bukhari 2968
In-book reference : Book 56, Hadith 177
USC-MSA web (English) reference : Vol. 4, Book 52, Hadith 212
  (deprecated numbering scheme)