It was narrated from 'Amr bin Shu'aib, from his father, from his grandfather, that the Prophet ﷺ forbade sitting in circles on Friday before Jumu'ah prayer, and buying and selling in the Masjid.  

أَنَّ النَّبِيَّ ﷺ نَهَى عَنِ التَّحَلُّقِ يَوْمَ الْجُمُعَةِ قَبْلَ الصَّلاَةِ وَعَنِ الشِّرَاءِ وَالْبَيْعِ فِي الْمَسْجِدِ