Ibn 'Abbas reported that while Gabriel was sitting with the Apostle (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).
'Abd al-Rahman b. Yazid reported
I met Abu Mas'ud near the House (Ka'ba) and said to him: A hadith has been conveyed to me on your authority about the two (concluding verses of Surah al-Baqara. He said: Yes. The Messenger of Allah (ﷺ) (in fact) said: Anyone who recites the two verses at the end of Surah al-Baqara at night, they would suffice for him.
This hadith has been narrated by Mansur with the same chain of transmitters.
Abu Mas'ud reported Allah's Messenger (ﷺ) as saying
If anyone recites the two verses at the end of Surah al-Baqara at night, they would suffice for him 'Abd al-Rahman said: I met Abu Mas'ud and he was circumambulating the House (of Allah) and asked him about this (tradition) and he narrated it to me from the Messenger of Allah (ﷺ).
A hadith like this has been narrated by Abu Mas'ud from the Messenger of Allah (ﷺ) through another chain of transmitters.
It is through another chain of transmitters that this hadith has been reported by Abu Mas'ud from the Messenger of Allah (ﷺ).