It is narrated from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) passed by Abdullah bin Mas'ud (may Allah be pleased with him) while he was reciting (the Qur'an), and I was with him (peace and blessings be upon him). Then he mentioned the whole story, except that he did not mention the talking after Isha.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2131