Sahih Al Bukhari – Book of Virtues Of The Qur'an
Volumn 006, Book 061, Hadith Number 534.
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Narated By Abu Said Al-Khudri : The Prophet said to his companions, "Is it difficult for any of you to recite one third of the Qur'an in one night?" This suggestion was difficult for them so they said, "Who among us has the power to do so, O Allah's Apostle?" Allah Apostle replied: " Allah (the) One, the Self-Sufficient Master Whom all creatures need.' (Surat Al-Ikhlas 112.1 to the End) is equal to one third of the Qur'an."
Junaid Tahir