Sahih Muslim
The Book of Prayers (Kitab Al-Salat)
Book Number: 004 / Hadith Number: 1761
'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 (may peace be upon him) (in fact) said: Anyone who recites the two verses at the end of Surah al-Baqara at night, they would suffice for him.