While the Messenger of Allah ﷺ was sitting with Jibreel beside him, he heard a creaking sound from above. Jibreel
raised his eyes to the sky and said, "This is a gate in heaven that has been opened today, and it has never been opened before."An angel descended through it and came to the Prophet ﷺ and said, "Receive glad tidings of two lights given to you that were never 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 from them without being granted what you ask."
أخبرنا محمد بن عبد الله بن المبارك المخرمي قال حدثنا يحيى بن آدم قال حدثنا أبو الأحوص عن عمار بن رزيق عن عبد الله بن عيسى عن سعيد بن جبير
بينما رسول الله ﷺ وعنده جبريل عليه السلام إذ سمع نقيضا فوقه فرفع جبريل عليه السلام بصره إلى السماء فقال هذا باب قد فتح من السماء ما فتح قط قال فنزل منه ملك فأتى النبي ﷺ فقال أبشر بنورين أوتيتهما لم يؤتهما نبي قبلك فاتحة الكتاب وخواتيم سورة البقرة لم تقرأ حرفا منهما إلا أعطيته
Muslim reported it in "Prayer of the Traveler," in the chapter on the merit of Fatihah and the closing verses of Surah Baqarah etc., hadith no. 806, from the hadith of Abu Ahwas with the same wording, and it is also found in Kubra, hadith no. 984.