Sunan an-Nasa'i, Hadith 764 ⓘ
Narrated Umar bin Abi Salamah: It was narrated from Umar bin Abi Salamah that he saw Messenger of Allahpraying in a single garment in the house of Umm Salamah, putting the ends of it on his shoulders."
أَخْبَرَنَا قُتَيْبَةُ، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ، أَنَّهُ رَأَى رَسُولَ اللَّهِ صلى الله عليه وسلم يُصَلِّي فِي ثَوْبٍ وَاحِدٍ فِي بَيْتِ أُمِّ سَلَمَةَ وَاضِعًا طَرَفَيْهِ عَلَى عَاتِقَيْهِ .
also referenced under: Book 9, Hadith 23 (In-Book) & Volume 1, Book 9, Hadith 765 (DarusSalam)