Al-Kāfi - Volume 3 > Sprucing up on Fridays
Hadith #6

6ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنْ مُوسَى بْنِ سَعْدَانَ عَنْ عَبْدِ الله بْنِ سِنَانٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ مَنْ أَخَذَ مِنْ شَارِبِهِ وَقَلَّمَ مِنْ أَظْفَارِهِ وَغَسَلَ رَأْسَهُ بِالْخِطْمِيِّ يَوْمَ الْجُمُعَةِ كَانَ كَمَنْ أَعْتَقَ نَسَمَةً.

6. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Musa ibn Sa‘dan from ‘Abd Allah ibn Sinan who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘One who trims his mustache and fingernails and washes his head with marshmallow on Friday, he is like one who sets free a human being.’”