Mustadrak al-Hakim — Hadith 1046

Abu Salamah said: I said (to myself): By Allah! If I were to go to Abu Sa'id al-Khudri (may Allah be pleased with him) and ask him about this hour, perhaps he would have some knowledge of it. So I came to him and said: O Abu Sa'id! Abu Hurayrah has told us about that hour on Friday; do you have any knowledge of it? He said: We asked the Prophet (peace and blessings be upon him) about it, and he (peace and blessings be upon him) said: "I was informed of that hour, then I was made to forget it, just as I was made to forget the Night of Qadr." Then I left him and went to Abdullah bin Salam. Then the narrator mentioned the whole hadith.
This is an authentic supporting narration (shahid) for the hadith of Yazid bin al-Had and Muhammad bin Ishaq, on the condition of the two Shaykhs, but they did not record it.