Narrated 'Aishah (RA):

Allah's Messenger (ﷺ) was asked in the expedition of Tabuk about the Sutra of the person who is offering the prayer; he said , "It is (something) like the back of a saddle." [Reported by Muslim].

وَعَنْ عَائِشَةَ ‏- رَضِيَ اَللَّهُ عَنْهَا‏- قَالَتْ : { سُئِلَ رَسُولُ اَللَّهِ ‏- صلى الله عليه وسلم ‏-‏- فِي غَزْوَةِ تَبُوكَ ‏- عَنْ سُتْرَةِ اَلْمُصَلِّي .‏ فَقَالَ : "مِثْلُ مُؤْخِرَةِ اَلرَّحْلِ } أَخْرَجَهُ مُسْلِمٌ .‏ [1]‏