Al-Adab Al-Mufrad 304
Anas reported that the Prophet ﷺ was the best of people, the most generous of people and most courageous of people. One night the people of Madina were alarmed by a noise and the people went towards its source. The Prophet ﷺ met them, having already reached the source of the noise before them and he was saying, "Do not be alarmed. Do not be alarmed." He was riding a horse belonging to Abu Talha without a saddle and a sword was hung around his neck. He said, "I found it (the horse) like a great river" or it was a great river (meaning its speed).
حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، قَالَ: أَخْبَرَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ قَالَ: كَانَ النَّبِيُّ ﷺ أَحْسَنَ النَّاسِ، وَأَجْوَدَ النَّاسِ، وَأَشْجَعَ النَّاسِ، وَلَقَدْ فَزِعَ أَهْلُ الْمَدِينَةِ ذَاتَ لَيْلَةٍ، فَانْطَلَقَ النَّاسُ قِبَلَ الصَّوْتِ، فَاسْتَقْبَلَهُمُ النَّبِيُّ ﷺ قَدْ سَبَقَ النَّاسَ إِلَى الصَّوْتِ وَهُوَ يَقُولُ: لَنْ تُرَاعُوا، لَنْ تُرَاعُوا، وَهُوَ عَلَى فَرَسٍ لأَبِي طَلْحَةَ عُرْيٍ، مَا عَلَيْهِ سَرْجٌ، وَفِي عُنُقِهِ السَّيْفُ، فَقَالَ: لَقَدْ وَجَدْتُهُ بَحْرًا، أَوْ إِنَّهُ لَبَحْرٌ.