The Book of Prayer
Bulugh al-Maram #498
كتاب الصلاة
وَعَنْ أَنَسٍ قَالَ: «صَلَّى رَسُولُ اَللَّهِ - صلى الله عليه وسلم -فَقُمْتُ وَيَتِيمٌ خَلْفَهُ, وَأُمُّ سُلَيْمٍ خَلْفَنَا.» مُتَّفَقٌ عَلَيْهِ, وَاللَّفْظُ لِلْبُخَارِيِّ
Narrated Anas (RA):
Allah's Messenger (ﷺ) prayed and an orphan and I prayed behind him and Umm Sulaim (RA) was behind us.
وَعَنْ أَنَسٍ قَالَ: "صَلَّى رَسُولُ اَللَّهِ - صلى الله عليه وسلم -فَقُمْتُ وَيَتِيمٌ خَلْفَهُ, وَأُمُّ سُلَيْمٍ خَلْفَنَا." مُتَّفَقٌ عَلَيْهِ, وَاللَّفْظُ لِلْبُخَارِيِّ
Allah's Messenger (ﷺ) prayed and an orphan and I prayed behind him and Umm Sulaim (RA) was behind us.
— Bulugh al-Maram, Hadith 498