Sahih Muslim 806
The Book of Prayer - Travellers
The virtue of al-Fatihah and the closing verse of Surat al-Baqarah; and the encouragement to recite the two verses at the end of Surat al-Baqarah
Ibn 'Abbas reported that while Gabriel was sitting with the Messenger (ﷺ) he heard a creaking sound above him. He lifted his head and said: This is a gate opened in heaven today which had never been opened before. Then when an angel descended through it, he said: This is an angel who came down to the earth who had never come down before. He greeted and said: Rejoice in two lights given to you which have not been given to any prophet before you: Fatihat al-Kitab and the concluding verses of Surah al-Baqara. You will never recite a letter from them for which you will not be given (a reward).