Volume 7 · Book 61 · Hadith 560
Narrated Abu Mas'ud Al-Ansari: The Prophet said, "If one recites the last two Verses of Surat-al-Baqara at night, it is sufficient for him (for that night)."
— Sahih Bukhari, Volume 7, Book 61: Virtues of the Qur'an, Hadith #560