Sayyiduna Anas (may Allah be pleased with him) narrates: One night the Prophet (peace and blessings be upon him) came out, intending to tell us about Laylat al-Qadr; he had been informed of it. He heard the noise of people arguing (in the mosque), and the knowledge of it was taken away from him.
Abu Ya'la and al-Tabarani in al-Mu'jam al-Awsat recorded it. The Tabi'i has dropped out of it, and its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5049