It is narrated from Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "I was given Surah al-Baqarah from 'the first Remembrance' (the Preserved Tablet, or the original source of the earlier scriptures)." This hadith has a sahih (authentic) chain, but the two Shaykhs (Bukhari and Muslim) did not record it.