Allah's Messenger (ﷺ) said, "When the Imam is delivering the Khutba, and you ask your companion to keep quiet and listen, then no doubt you have done an evil act."
Reference: Sahih al-Bukhari 934 In-book : Book 11, Hadith 58 USC-MSA web (English) : Vol. 2, Book 13, Hadith 56 (deprecated)
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