Sahih al-Bukhari 353
Sahih al-Bukhari · Book 8: Prayers (Salat) · To tie Izar (dress worn below the waist) at one's back while offering Salat (prayers)
Narrated Muhammad bin Al Munkadir:
حَدَّثَنَا مُطَرِّفٌ أَبُو مُصْعَبٍ ، قَالَ حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ أَبِي الْمَوَالِي ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ ، قَالَ رَأَيْتُ جَابِرَ بْنَ عَبْدِ اللَّهِ يُصَلِّي فِي ثَوْبٍ وَاحِدٍ وَقَالَ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يُصَلِّي فِي ثَوْبٍ.
I saw Jabir bin `Abdullah praying in a single garment and he said that he had seen the Prophet (ﷺ) praying in a single garment.