"Is it difficult for any of you

Narrated Abu Said Al-Khudri (Radi-Allahu 'anhu):

The Prophet (Sallallahu 'Alaihi Wa Sallam) 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's Apostle (Sallallahu 'Alaihi Wa
Sallam) 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."

Bukhari Vol. 6 : No. 534