Sahih Muslim Book - 7, Hadith - 1959

وَحَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ أَخْبَرَنَا اللَّيْثُ عَنْ يَحْيَى بْنِ سَعِيدٍ عَنْ عَمْرَةَ عَنْ عَائِشَةَ أَنَّهَا قَالَتْ كَانَ النَّاسُ أَهْلَ عَمَلٍ وَلَمْ يَكُنْ لَهُمْ كُفَاةٌ فَكَانُوا يَكُونُ لَهُمْ تَفَلٌ فَقِيلَ لَهُمْ لَوِ اغْتَسَلْتُمْ يَوْمَ الْجُمُعَةِ.

It was narrated from 'Urwah that 'Aishah said: "The people were workers and they did not have any servants, so they smelled bad. It was said to them: 'You should perform Ghusl on Fridays."'