It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that he said: While Jibril (peace be upon him) was sitting with the Messenger of Allah (peace and blessings be upon him), he heard a creaking sound from the sky. He raised his head and said: "A door of the sky has been opened that has never been opened before. Then an angel came down from it and said: 'Rejoice in two lights that you have been given, which no prophet before you was given: the Opening of the Book (al-Fatihah) and the closing verses of Surah al-Baqarah. You will not recite a single letter of them except that you will be given it (the supplication asked in it).'" This hadith is sahih (authentic) on the condition of the two Shaykhs (Bukhari and Muslim), but they did not record it in this form; Imam Muslim recorded it in abridged form.