The Prophet ﷺ asked: “Is any one of you unable to recite one-third of the Qur'ān in one night? They said: How could anyone read one-third of the Qur'ān (in one night)? He said: Qul huwa Allāhu aḥad (Sūrat al-Ikhlāṣ) is equivalent to one-third of the Qur'ān.” Reference: Sahih Muslim 811a .