The Book of the Qiblah
9/4. Chapter:
The Sutra (screen) of one who is praying
Sunan an-Nasai
أَخْبَرَنَا الْعَبَّاسُ بْنُ مُحَمَّدٍ الدُّورِيُّ، قَالَ حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يَزِيدَ، قَالَ حَدَّثَنَا حَيْوَةُ بْنُ شُرَيْحٍ، عَنْ أَبِي الأَسْوَدِ، عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ سُئِلَ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي غَزْوَةِ تَبُوكَ عَنْ سُتْرَةِ الْمُصَلِّي فَقَالَ " مِثْلُ مُؤْخِرَةِ الرَّحْلِ " .
It was narrated that Aisha(ra) said: "The messenger of Allah(ﷺ) was asked during the campaign of Tabuk about the Sutra of one who is praying. He said: "Something as high as the back of a camel saddle."
Reference : Sunan an-Nasa'i 746In-book reference : Book 9, Hadith 5English translation : Vol. 1, Book 9, Hadith 747