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كتاب الجهاد والسير
56  
Fighting for the Cause of Allah (Jihaad)
(50)
Chapter: Riding on an unmanageable animal or a stallion horse
(50)
باب الرُّكُوبِ عَلَى الدَّابَّةِ الصَّعْبَةِ وَالْفُحُولَةِ مِنَ الْخَيْلِ
Sahih al-Bukhari 2862

Narrated Anas bin Malik:

There was a feeling of fright in Medina, so the Prophet (ﷺ) borrowed a horse called Mandub belonging 'to Abu Talha and mounted it. (On his return), he said, "I did not see anything of fright and I found this horse very fast."

حَدَّثَنَا أَحْمَدُ بْنُ مُحَمَّدٍ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا شُعْبَةُ، عَنْ قَتَادَةَ، سَمِعْتُ أَنَسَ بْنَ مَالِكٍ ـ رضى الله عنه ـ قَالَ كَانَ بِالْمَدِينَةِ فَزَعٌ، فَاسْتَعَارَ النَّبِيُّ صلى الله عليه وسلم فَرَسًا لأَبِي طَلْحَةَ، يُقَالُ لَهُ مَنْدُوبٌ فَرَكِبَهُ، وَقَالَ ‏ "‏ مَا رَأَيْنَا مِنْ فَزَعٍ، وَإِنْ وَجَدْنَاهُ لَبَحْرًا ‏"‏‏.‏
Reference : Sahih al-Bukhari 2862
In-book reference : Book 56, Hadith 78
USC-MSA web (English) reference : Vol. 4, Book 52, Hadith 114
  (deprecated numbering scheme)