Mishkat al-Masabih #1309
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: " إِذَا قُلْتَ لِصَاحِبِكَ يَوْمَ الْجُمُعَةِ أنصت وَالْإِمَام يخْطب فقد لغوت)
He reported God's Messenger as saying, “When you tell your companion on Friday to be silent while the imam is preaching, you are guilty of idle talk."
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #1309 from Mishkat al-Masabih, in the Book of Prayer.