Sahih al-Bukhari 903
Narrated Yahya bin Sa`id:
I asked `Amra about taking a bath on Fridays. She replied, " Aisha said, 'The people used to work (for 
their livelihood) and whenever they went for the Jumua prayer, they used to go to the mosque in the 
same shape as they had been in work. So they were asked to take a bath on Friday.' "
حَدَّثَنَا عَبْدَانُ، قَالَ أَخْبَرَنَا عَبْدُ اللَّهِ، قَالَ أَخْبَرَنَا يَحْيَى بْنُ سَعِيدٍ، أَنَّهُ سَأَلَ عَمْرَةَ عَنِ الْغُسْلِ، يَوْمَ الْجُمُعَةِ فَقَالَتْ قَالَتْ عَائِشَةُ ـ رضى الله عنها ـ كَانَ النَّاسُ مَهَنَةَ أَنْفُسِهِمْ، وَكَانُوا إِذَا رَاحُوا إِلَى الْجُمُعَةِ رَاحُوا فِي هَيْئَتِهِمْ فَقِيلَ لَهُمْ لَوِ اغْتَسَلْتُمْ‏.‏