Hadith 181

وعن عائشة قالت : سئل النبي صلى الله عليه وآله وسلم في غزوة تبوك عن سترة المصلي . فقال : « مثل مؤخرة الرحل ». أخرجه مسلم
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].
Hadith Reference بلوغ المرام / 181
Hadith Grading محدثین: صحيح
Hadith Takhrij «أخرجه مسلم، الصلاة، باب سترة المصلي والندب إلي الصلاة إلي سترة...، حديث:500.»
Explanation & Benefits
Shaykh Safi ur-Rahman Mubarakpuri
Lexical Explanation:
«فِي غَزْوَةِ تَبُوك» This expedition took place in Rajab, 9 AH, against the Romans, but actual fighting did not occur. Tabuk is a place in the north of Hijaz, near Palestine.
«مُؤْخَرَةِ» There is a dammah on the letter "meem", the "hamzah" is sakin, and both fathah or kasrah are permissible on the "kha". Also, fathah on the "hamzah" and tashdid and either fathah or kasrah on the "kha" are both valid. Furthermore, fathah on the "meem" and sukun on the "waw", without the "hamzah", and kasrah under the "kha" are also correct. This refers to the wooden part of the camel's saddle against which the rider leans.
«الرَّحْل» The saddle or similar item that is placed on the back of a camel.

Benefit:
It is established from the ahadith that there should be a sutrah in front of the one performing prayer. The height of the sutrah should be as much as the rear wooden part of a camel's saddle.
Source: Bulugh al-Maram: Commentary by Safiur Rahman Mubarakpuri, Page: 181