Anas bin Malik reported,

The Messenger of Allah ﷺ was the most handsome of people, the most generous of people, and the most courageous of people.One night, the people of Medina were alarmed by a noise, so they set out toward the source of the sound. The Messenger of Allah ﷺ met them on his way back, having already investigated the sound for them. He was riding a horse belonging to Abu Talha, bareback with no saddle, and a sword hung from his neck. He was saying to the people, "Do not be afraid, do not be afraid."He said of the horse, "We found him to be like a sea," or, "Indeed, he is like a sea."Anas said that the horse had previously been slow, but after that day, it was never outpaced.

حدثنا يونس حدثنا حماد يعني ابن زيد عن ثابت

عن أنس قال

كان رسول الله ﷺ أحسن الناس وكان أجود الناس وكان أشجع الناس قال ولقد فزع أهل المدينة ليلة فانطلق قبل الصوت فرجع رسول الله ﷺ راجعا قد استبرأ لهم الصوت وهو على فرس لأبي طلحة عري ما عليه سرج وفي عنقه السيف وهو يقول للناس لم تراعوا لم تراعوا وقال للفرس وجدناه بحرا أو إنه لبحر قال أنس وكان الفرس قبل ذلك يبطأ قال ما سبق بعد ذلك