It is narrated from Imam al-A'mash (may Allah have mercy on him) that Sayyiduna Anas bin Malik (may Allah be pleased with him) said: "The Messenger of Allah (peace and blessings be upon him) was informed of the Night of Decree (Laylat al-Qadr), so he (peace and blessings be upon him) came out (of his house) intending to tell us about it, but he heard clamour in the mosque."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-A'mash except Qurran."
Hadith Referenceالمعجم الأوسط / باب الميم / 8186
Hadith Takhrij«أخرجه أبو يعلى فى «مسنده» برقم: 4021، وابن حجر فى «المطالب العالية» برقم: 1123»