Hadith 522
مثل المؤمن يوم الجمعة كمثل المحرم لا ياخذ من شعره ولا من اظفاره حتي يقضي الصلاة
"The example of a believer on the day of Jumu'ah is like that of a person in the state of Ihram; he should neither cut his hair nor his nails until he has completed the prayer."
