Musnad Ahmad 30:2025

Ibrahim ibn Abi al-Abbas narrated to us, Abu Uways narrated to us, from al-Zuhri, that Sa'id ibn al-Musayyib informed him that Abu Hurayrah said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "If you say to your companion, 'Be silent,' while the Imam is delivering the sermon, then you have engaged in idle talk."