It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him) that he said: I entered the mosque on Friday while the Prophet (peace and blessings be upon him) was delivering the sermon, and I sat down near Sayyiduna Ubayy bin Ka'b (may Allah be pleased with him). The Prophet (peace and blessings be upon him) recited Surah Bara'ah (al-Tawbah), and I asked Ubayy: When was this surah revealed? He looked at me with displeasure and did not speak to me; (the narrator mentioned the whole hadith). Imam al-Hakim says: I found it like this in my book, and I searched for it at full length in the Musnad collections but could not find it, and this hadith has an authentic chain (sahih al-isnad).