Sahih al-Bukhari 2866

Arabic

حَدَّثَنَا عَمْرُو بْنُ عَوْنٍ، حَدَّثَنَا حَمَّادٌ، عَنْ ثَابِتٍ، عَنْ أَنَسٍ ـ رضى الله عنه اسْتَقْبَلَهُمُ النَّبِيُّ صلى الله عليه وسلم عَلَى فَرَسٍ عُرْىٍ، مَا عَلَيْهِ سَرْجٌ، فِي عُنُقِهِ سَيْفٌ‏.‏

English translation

Narrated Anas:The Prophet (ﷺ) met them (i.e. the people) while he was riding an unsaddled horse with his sword slung over his shoulder

Reference: Sahih al-Bukhari 2866, Book of Fighting for the Cause of Allah (Jihaad). English translation by Dr. Muhammad Muhsin Khan.