Sahih al-Bukhari 355
Sahih al-Bukhari · Book 8: Prayers (Salat) · To offer As-Salat (the prayers) with a single garment wrapped round the body
Narrated `Umar bin Abi Salama:
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى ، قَالَ حَدَّثَنَا يَحْيَى ، قَالَ حَدَّثَنَا هِشَامٌ ، قَالَ حَدَّثَنِي أَبِي ، عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ ، أَنَّهُ رَأَى النَّبِيَّ صلى الله عليه وسلم يُصَلِّي فِي ثَوْبٍ وَاحِدٍ فِي بَيْتِ أُمِّ سَلَمَةَ، قَدْ أَلْقَى طَرَفَيْهِ عَلَى عَاتِقَيْهِ.
I saw the Prophet (ﷺ) offering prayers in a single garment in the house of Um-Salama and he had crossed its ends around his shoulders.