Al-Adab Al-Mufrad #304

Anas reported that the Prophet, may Allah bless him and grant him peace, 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, may Allah bless him and grant him peace, 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).