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.

ارْتَقَيْتُ فَوْقَ بَيْتِ حَفْصَةَ فَرَأَيْتُ النَّبِيَّ ﷺ يَقْضِي حَاجَتَهُ مُسْتَدْبِرَ الْقِبْلَةِ مُسْتَقْبِلَ الشَّأْمِ