(3) باب فِي الإِنْصَاتِ يَوْمَ الْجُمُعَةِ فِي الْخُطْبَةِ
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
If you (even) ask your companion to be quiet on Friday while the Imam is delivering the sermon, you have in fact talked irrelevance.
Reference: Sahih Muslim 851 a
In-book reference: Book 7, Hadith 15
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1846