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 ‏"‏‏.‏