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)." (ES)
English reference (ES): Vol. 1, Book 5, Hadith 1110 (ES)
Arabic reference (ES): Book 5, Hadith 1164 (ES)