When anyone of you prays, let him do so behind a barrier, even if an arrow
Authentic hadithعن سَبْرة بن معبد الجهني رضي الله عنه عن النبي صلى الله عليه وسلم قال: «إذا صلى أحدكم، فليسْتَتِر لصلاته، ولو بسهم».
Sabrah ibn Ma‘bad al-Juhani (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) said: "When anyone of you prays, let him do so behind a barrier, even if an arrow."
Explanation
The Hadīth points out that it is recommended for a person to put something before him as a barrier when he offers prayer. That barrier can be anything he sets up in front of him, even if it were short or thin like an arrow. Indeed, this is one of the manifestations of the ease and leniency of the Islamic Shariah.
Source · Narrated by Ahmad
From the Hadith Encyclopedia (hadeethenc.com).