It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "When you say to your companion 'Be quiet,' then you too have engaged in idle talk." By this, the Messenger of Allah, peace and blessings be upon him, meant speaking during the Friday sermon.
Hadith Referenceالسنن المأثورة / باب ما جاء في النداء في السفر / 46
Hadith Takhrijصحيح مسلم ،الجمعة باب فى الانصات يوم الجمعة في الخطبة، رقم: 851۔