Sunan an-Nasa'i, Volume 1, Book 9, Hadith 747 (DarusSalam) ⓘ

It was narrated that Aisha(ra) said: "The messenger of Allah 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."

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 ‏" ‏ ‏.‏