Sahih al-Bukhari 3102
Book 57: One-fifth of Booty to the Cause of Allah (Khumus) · Narrated by `Abdullah bin `Umar
Arabic
حَدَّثَنَا إِبْرَاهِيمُ بْنُ الْمُنْذِرِ، حَدَّثَنَا أَنَسُ بْنُ عِيَاضٍ، عَنْ عُبَيْدِ اللَّهِ، عَنْ مُحَمَّدِ بْنِ يَحْيَى بْنِ حَبَّانَ، عَنْ وَاسِعِ بْنِ حَبَّانَ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ ارْتَقَيْتُ فَوْقَ بَيْتِ حَفْصَةَ، فَرَأَيْتُ النَّبِيَّ صلى الله عليه وسلم يَقْضِي حَاجَتَهُ، مُسْتَدْبِرَ الْقِبْلَةِ، مُسْتَقْبِلَ الشَّأْمِ.
English translation
Narrated `Abdullah bin `Umar:Once I went upstairs in Hafsa's house and saw the Prophet (ﷺ) answering the call of nature with his back towards the Qibla and facing Sham
Reference: Sahih al-Bukhari 3102, Book of One-fifth of Booty to the Cause of Allah (Khumus). English translation by Dr. Muhammad Muhsin Khan.