ENOfficial
Anas reported that there was consternation in Medina. The Messenger of Allah (ﷺ) borrowed the horse from Abu Talha which was called Mandub. He rode it and said: We have found no reason for consternation, and we have found it to be (as quick as a torrent) of water.
Source: sunnah.com
Other translations
Arabic
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا وَكِيعٌ، عَنْ شُعْبَةَ، عَنْ قَتَادَةَ، عَنْ أَنَسٍ، قَالَ كَانَ بِالْمَدِينَةِ فَزَعٌ فَاسْتَعَارَ النَّبِيُّ صلى الله عليه وسلم فَرَسًا لأَبِي طَلْحَةَ يُقَالُ لَهُ مَنْدُوبٌ فَرَكِبَهُ فَقَالَ " مَا رَأَيْنَا مِنْ فَزَعٍ وَإِنْ وَجَدْنَاهُ لَبَحْرًا " .
sunnah.com