Hadithcore
Riyad as-Salihin, 1011

Abu Sa'id Al-Khudri (May Allah be pleased with him) reported:

A man heard another reciting Surat Al-Ikhlas repeatedly. The next morning he came to the Messenger of Allah (ﷺ) and informed him about it as if he considered it to be of little reward. On that the Messenger of Allah (ﷺ) said, "By Him in Whose Hand my soul is, this Surah is equal to one-third of the Qur'an." <b>[Al- Bukhari]</b>.

وعنه أن رجل سمع رجلاً يقرأ‏:‏‏{‏قل هو الله احد‏}‏ يرددها فلما أصبح جاء إلى رسول الله صلى الله عليه وسلم، فذكر ذلك له وكان الرجل يتقالها فقال رسول الله صلى الله عليه وسلم ‏:‏‏

‏ والذي نفسي بيده، إنها لتعدل ثلث القرآن‏

‏‏.‏ ‏(‏‏(‏رواه البخاري ‏)‏‏)‏‏.‏

References1 variant
In-Book Reference
Book 8, Hadith 21
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) Surat al-Ikhlās is called as such because Allah Almighty devoted it to Himself, not mentioning in it but His names and attributes (the Arabic term Ikhlās means sincerity and devotion). It comprises the oneness of Allah Almighty.<br> 2) Tawhid (belief in the oneness of Allah) covers one third of the Qur’an, whose sciences revolve around three branches: Tawhid, rulings, and recompense. Hence, Surat al-Ikhlās is a third of the Qur’an, because it contains pure Tawhid.<br> 3) In declaring Surat al-Ikhlās a third of the Qur’an, the Hadith refers to the reward and it does not mean that this Surah is sufficient in place of the other meanings in the Qur’an.
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