اَخْبَرَنَا مُحَمَّدُ بْنُ بَکْرٍ، اَنَا ابْنُ جُرَیْجٍ، اَخْبَرَنِی الْحَسَنُ بْنُ مُسْلِمٍ عَنْ طَاؤُوْسٍ قَالَ: قَالَ رَسُوْلُ اللّٰهِ صَلَّی اللّٰهُ عَلَیْهِ وَسَلَّمَ حَقٌّ عَلٰی کُلِّ مُسْلِمٍ بَلَغَ الْحَلْمَ، اَنْ یَّتَطَهَّرَ لِلّٰهِ فِی کُلِّ سَبْعَةِ اَیَّامٍ یَوْمًا، وَاِنْ لَمْ یَکُنْ جُنُبًا، یَغْسِلُ رَأْسَهٗ وَجِلْدَهٗ یَوْمُ الْجُمُعَةِ.
Tawoos (may Allah have mercy on him) narrated, the Messenger of Allah (peace and blessings be upon him) said: "It is obligatory upon every adult person to thoroughly clean himself for the sake of Allah once every seven days, even if he is not in a state of major impurity. On Friday, he should wash his head and his body."