313. hadíth
وَقَالَ مُوسَى بْنُ بَكْرٍ لِلصَّادِقِ عَلَيْهِ اَلسَّلاَمُ: إِنَّ أَصْحَابَنَا يَقُولُونَ إِنَّمَا أَخْذُ اَلشَّارِبِ وَ اَلْأَظْفَارِ يَوْمَ اَلْجُمُعَةِ فَقَالَ «سُبْحَانَ اَللَّهِ خُذْهَا إِنْ شِئْتَ فِي يَوْمِ اَلْجُمُعَةِ وَ إِنْ شِئْتَ فِي سَائِرِ اَلْأَيَّامِ.
Musa ibn Bakr said to Imam Jafar ibn Muhammad Al-Sadiq (a.s): "Our companions say that trimming the mustache and nails is only on Jumu’ah." Imam (a.s) replied: "Glory be to Allah (swt)! Trim them if you wish on Jumu’ah, or if you wish, on any other day."