Sahih Bukhari
Virtues of the Quran
Volume: 006 / Book Number: 061 / Hadith Number: 530
Narrated Abu Mas'ud:
The Prophet said, "If somebody recited the last two Verses of Surat Al-Baqara at night, that will be sufficient for him."
Narrated Abu Huraira: Allah 's Apostle ordered me to guard the Zakat revenue of Ramadan. Then somebody came to me and started stealing of the foodstuff. I caught him and said, "I will take you to Allah's Apostle!" Then Abu Huraira described the whole narration and said:) That person said (to me), "(Please don't take me to Allah's Apostle and I will tell you a few words by which Allah will benefit you.) When you go to your bed, recite Ayat-al-Kursi, (2.255) for then there will be a guard from Allah who will protect you all night long, and Satan will not be able to come near you till dawn." (When the Prophet heard the story) he said (to me), "He (who came to you at night) told you the truth although he is a liar; and it was Satan."