When anyone of you beats his brother, he should avoid the face. [Al-Bukhari]
قال رسول الله -صلى الله عليه وسلم-: «إذا ضَرَبَ أَحَدُكُمْ أخاه فَلْيَجْتَنِب الوجْهَ». (البخاري)
