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

3ـ مُحَمَّدُ بْنُ يَحْيَى عَنْ مُحَمَّدِ بْنِ الْحُسَيْنِ عَنْ صَفْوَانَ بْنِ يَحْيَى عَنْ مَنْصُورِ بْنِ حَازِمٍ عَنْ أَبِي عَبْدِ الله (عَلَيْهِ الْسَّلام) قَالَ الْغُسْلُ يَوْمَ الْجُمُعَةِ عَلَى الرِّجَالِ وَالنِّسَاءِ فِي الْحَضَرِ وَعَلَى الرِّجَالِ فِي السَّفَرِ.

3. Muhammad ibn Yahya has narrated from Muhammad ibn al-Husayn from Safwan ibn Yahya from Mansur ibn Hazim who has said the following: “Abu ‘Abd Allah, ‘Alayhi al-Salam, has said, ‘Both men and women should take a shower on Friday when at home. On the journey men should take a shower on Friday.’”