Sahih al-Bukhari 356
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 عُبَيْدُ بْنُ إِسْمَاعِيلَ ، قَالَ حَدَّثَنَا أَبُو أُسَامَةَ ، عَنْ هِشَامٍ ، عَنْ أَبِيهِ ، أَنَّ عُمَرَ بْنَ أَبِي سَلَمَةَ ، أَخْبَرَهُ قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يُصَلِّي فِي ثَوْبٍ وَاحِدٍ مُشْتَمِلاً بِهِ فِي بَيْتِ أُمِّ سَلَمَةَ، وَاضِعًا طَرَفَيْهِ عَلَى عَاتِقَيْهِ.
In the house of Um-Salama I saw Allah's Messenger (ﷺ) offering prayers, wrapped in a single garment around his body with its ends crossed round his shoulders.