Sahih al-Bukhari 6212

Arabic

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ شُعْبَةَ، قَالَ حَدَّثَنِي قَتَادَةُ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ كَانَ بِالْمَدِينَةِ فَزَعٌ فَرَكِبَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَرَسًا لأَبِي طَلْحَةَ فَقَالَ ‏ "‏ مَا رَأَيْنَا مِنْ شَىْءٍ، وَإِنْ وَجَدْنَاهُ لَبَحْرًا ‏"‏‏.‏

English translation

Narrated Anas bin Malik:There was a state of fear in Medina. Allah's Messenger (ﷺ) rode a horse belonging to Abu Talha (in order to see the matter). The Prophet (ﷺ) said, "We could not see anything, and we found that horse like a sea (fast in speed)

Reference: Sahih al-Bukhari 6212, Book of Good Manners and Form (Al-Adab). English translation by Dr. Muhammad Muhsin Khan.