It wasnarrated from Abu Hurairah that the Prophet (ﷺ) said:
"Ifyou sayto your companions: 'Be quiet' on a Friday while the Imam isdelivering the sermon, you have engaged in Laghw (idle talk orbehaviour)."
English reference: Vol. 1, Book 5, Hadith 1110
Arabic reference: Book 5, Hadith 1164