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(PBUH) 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." Translation Not Available

Book Ref: Sunan An Nisai Book 9 Hadith 746
Web Ref:  Sunan An Nisai Vol 1 Book 9 Hadith 747