Virtue: Narrated from Abu Sa’eed that a man heard another man reciting Qul Huwa Allaahu Ahad and repeating it. The next morning he came to the Messenger of Allah (peace and blessings of Allah be upon him) and told him about that. The man thought that it was too little, but the Messenger of Allah (peace and blessings of Allah be upon him) said: “By the One in Whose hand is my soul, it is equivalent to one-third of the Quran.”
Abu Darda’ reported Allah’s Messenger (ﷺ) as said: Is any one of you incapable of reciting a third of the Qur’an in a night? They (the Companions) asked: How could one recite a third of the Qur’an (in a night)? Upon this he (the Holy Prophet) said: “‘Say: He is Allah, One’ is equivalent to a third of the Qur’an.”
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Verse 1: Say, "He is Allah, [who is] One,
Verse 2: Allah, the Eternal Refuge.
Verse 3: He neither begets nor is born,
Verse 4: Nor is there to Him any equivalent."
Reference: Al-Bukhari #6643