The Book of Prayers
4/47. Chapter:
The Sutrah (Screen) For One Who Is Praying, And The Recommendation To Pray Facing A Sutrah. The Ruling On Passing In Front Of One Who Is Praying, And Preventing One Who Wants To Pass In Front. It Is Permissible To Lie Down In Front Of One Who Is Praying, Praying Towards One's Mount. The Command To Stand Close To The Sutrah. The Height Of The Suirah, And Related Matters
Sahih Muslim
حَدَّثَنَا أَحْمَدُ بْنُ حَنْبَلٍ، حَدَّثَنَا مُعْتَمِرُ بْنُ سُلَيْمَانَ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يَعْرِضُ رَاحِلَتَهُ وَهُوَ يُصَلِّي إِلَيْهَا .
Ibn 'Umar said: The Apostle of Allah (ﷺ) used to place his camel (towards the Ka'ba) and said prayer in its direction.
Reference : Sahih Muslim 502aIn-book reference : Book 4, Hadith 279USC-MSA web (English) reference : Book 4, Hadith 1012