Muhammad bin Ka'b (may Allah have mercy on him) said: When the Messenger of Allah (peace and blessings be upon him) would recite the Qur'an, the Companions (may Allah be pleased with them) would begin to recite along with him, until this verse was revealed in Surah Al-A'raf: "And when the Qur'an is recited, listen to it and be silent."
Hadith Referenceسنن سعید بن منصور / كتاب التفسير / 978
Hadith Gradingمحدثین:سنده ضعيف لضعف أبي معشر وإرساله، فإن محمد بن كعب تابعي، وهو حسن لغيره إلى محمد بن كعب كما سيأتي، فيبقى ضعفه لأجل الإرسال.