بُلُوغُ الْمَرَامِ
Bulugh al-Maram 260
The Book of Prayer
وَعَنْهَا قَالَتْ : { رَأَيْتُ رَسُولَ اَللَّهِ - صلى الله عليه وسلم -يَسْتُرُنِي , وَأَنَا أَنْظُرُ إِلَى اَلْحَبَشَةِ يَلْعَبُونَ فِي اَلْمَسْجِدِ . . . } اَلْحَدِيثَ . مُتَّفَقٌ عَلَيْهِ . [1]
Narrated ['Aishah (RA)]: I saw Allah's Messenger (ﷺ) at the door of my house screening me while I watched some Abyssinians (Ethiopians) who were playing in the mosque... (the narration). [Agreed upon].
Sunnah.com reference: Book 2, Hadith 132