The Chapter of the Qibla
Man Lā Yaḥḍuruh al-Faqīh|Volume 1|Book 1|Chapter 43
وَ نَهَى صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ عَنِ اَلْجِمَاعِ مُسْتَقْبِلَ اَلْقِبْلَةِ وَ مُسْتَدْبِرَهَا وَ نَهَى عَنِ اِسْتِقْبَالِ اَلْقِبْلَةِ بِبَوْلٍ أَوْ غَائِطٍ.
The Prophet, forbade engaging in sexual intercourse while facing or with one's back to the Qiblah. He also forbade facing the Qiblah when urinating or defecating.
- Ṣaḥīḥ al-Faqīh