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