Volume 6, Book 61, Number 534:
Narrated 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.”