Sahih al-Bukhari, Hadith 874 ⓘ
Narrated Anas: The Prophet prayed in the house of Um Sulaim; and I, along with an orphan stood behind him while Um Sulaim (stood) behind us.
حَدَّثَنَا أَبُو نُعَيْمٍ، قَالَ حَدَّثَنَا ابْنُ عُيَيْنَةَ، عَنْ إِسْحَاقَ، عَنْ أَنَسٍ، قَالَ صَلَّى النَّبِيُّ صلى الله عليه وسلم فِي بَيْتِ أُمِّ سُلَيْمٍ، فَقُمْتُ وَيَتِيمٌ خَلْفَهُ، وَأُمُّ سُلَيْمٍ خَلْفَنَا.
also referenced under: Book 10, Hadith 265 (In-Book) & Volume 1, Book 11, Hadith 833 (USC-MSA)