Abdullah bin Abbas reported,

While Jibreel was sitting with the Prophet ﷺ, he heard a creaking sound from above. He raised his head and said, "This is a gate in heaven that has been opened today, never having been opened before this day."Then an angel descended through it, and Jibreel said, "This is an angel who has come down to earth, never having descended before this day."The angel offered his greeting and said, "Receive glad tidings of two lights given to you that were not given to any prophet before you, the Opening of the Book and the closing verses of Surah al-Baqarah. You will not recite a single letter of them without being granted what you ask."

عن ابن عباس قال

بينما جبريل قاعد عند النبي ﷺ سمع نقيضا من فوقه، فرفع رأسه فقال: هذا باب من السماء فتح اليوم، لم يفتح قط إلا اليوم، فنزل منه ملك فقال: هذا ملك نزل إلى الأرض، لم ينزل قط إلا اليوم. فسلم، وقال: أبشر بنورين أوتيتهما، لم يؤتهما نبي قبلك: فاتحة الكتاب وخواتيم سورة البقرة، لن تقرأ بحرف منهما إلا أعطيته.