Sahih Bukhari
Sahih Bukhari Volume 006, Book 061, Hadith Number 574.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 61. Virtues of The Qur'an
Narrated By 'Abdullah bin 'Amr : Allah's Apostle said to me, "Recite the whole Qur'an in one month's time." I said, "But I have power (to do more than that)." Allah's Apostle said, "Then finish the recitation of the Qur'an in seven days, and do not finish it in less than this period."