A man heard another man reciting (Surat-Al-Ikhlas) 'Say He is Allah, (the) One.' (112. 1) repeatedly. The next morning he came to Messenger of Allah ﷺ and informed him about it as if he thought that it was not enough to recite. On that Messenger of Allah ﷺ said, "By Him in Whose Hand my life is, this Surah is equal to one-third of the Qur'an!"  

سَمِعَ رَجُلاً يَقْرَأُ {قُلْ هُوَ اللَّهُ أَحَدٌ} يُرَدِّدُهَا فَلَمَّا أَصْبَحَ جَاءَ إِلَى رَسُولِ اللَّهِ ﷺ فَذَكَرَ ذَلِكَ لَهُ وَكَأَنَّ الرَّجُلَ يَتَقَالُّهَا فَقَالَ رَسُولُ اللَّهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ  

A man heard another man reciting: Surat-ul-Ikhlas (The Unity) 'Say: He is Allah, the One (112) and he was repeating it. The next morning he came to Messenger of Allah ﷺ and mentioned the whole story to him as if he regarded the recitation of that Sura as insufficient On that, Messenger of Allah ﷺ said, "By Him in Whose Hand my soul is! That (Sura No. 112) equals one-third of the Qur'an."  

سَمِعَ رَجُلاً يَقْرَأُ {قُلْ هُوَ اللَّهُ أَحَدٌ} يُرَدِّدُهَا فَلَمَّا أَصْبَحَ جَاءَ إِلَى رَسُولِ اللَّهِ ﷺ فَذَكَرَ ذَلِكَ لَهُ وَكَأَنَّ الرَّجُلَ يَتَقَالُّهَا فَقَالَ رَسُولُ اللَّهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ  

A man heard another man reciting "Say: He is Allah, (the) One" and repeating it. When morning came he went to the Messenger of Allah ﷺ and told him about that. The Messenger of Allah ﷺ said: "By the One in Whose Hand is my soul, it is equal to one-third of the Quran."  

سَمِعَ رَجُلاً يَقْرَأُ { قُلْ هُوَ اللَّهُ أَحَدٌ } يُرَدِّدُهَا فَلَمَّا أَصْبَحَ جَاءَ إِلَى النَّبِيِّ ﷺ فَذَكَرَ ذَلِكَ لَهُ فَقَالَ رَسُولُ اللَّهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ  

A man heard another man reciting "Say, He is Allah, One" He was repeating it. When the next morning came, he went to the Messenger of Allah ﷺ and mentioned to him. The man tool it (this surah) as a small one. The Prophet ﷺ said: By Him in Whose Hand is my life, it is equivalent to a third of the Qur'an.  

سَمِعَ رَجُلاً يَقْرَأُ { قُلْ هُوَ اللَّهُ أَحَدٌ } يُرَدِّدُهَا فَلَمَّا أَصْبَحَ جَاءَ إِلَى رَسُولِ اللَّهِ ﷺ فَذَكَرَ ذَلِكَ لَهُ وَكَانَ الرَّجُلُ يَتَقَالُّهَا فَقَالَ النَّبِيُّ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ  

Yahya related to me from Malik from Abd ar-Rahman ibn Abdullah ibn Sasaca from his father that Abu Said al-Khudri heard a man reciting Surat al-Ikhlas (Sura 112), repeating it over and over again. In the morning he went to the Messenger of Allah ﷺ and mentioned it to him, as if he thought little of it. The Messenger of Allah ﷺ said, "Bythe One in whose hand my self is, it is equal to one third of the Qur'an."  

أَنَّهُ سَمِعَ رَجُلاً يَقْرَأُ قُلْ هُوَ اللَّهُ أَحَدٌ يُرَدِّدُهَا فَلَمَّا أَصْبَحَ غَدَا إِلَى رَسُولِ اللَّهِ ﷺ فَذَكَرَ ذَلِكَ لَهُ وَكَأَنَّ الرَّجُلَ يَتَقَالُّهَا فَقَالَ رَسُولُ اللَّهِ ﷺ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ  

A man heard another man reciting "Say, He is Allah, One" He was repeating it. When the next morning came, he went to the Messenger of Allah ﷺ and mentioned to him. The man tool it (this surah) as a small one. The Prophet ﷺ said: By Him in Whose Hand is my life, it is equivalent to a third of the Qur'an. (Using translation from Abū Dāʾūd 1461)  

سَمِعَ رَجُلًا يَقْرَأُ قُلْ هُوَ اللهُ أَحَدٌ يُرَدِّدُهَا فَلَمَّا أَصْبَحَ جَاءَ إِلَى النَّبِيِّ ﷺ فَذَكَرَ ذَلِكَ لَهُ فَقَالَ رَسُولُ اللهِ ﷺ «وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرْآنِ»  

"وَالَّذِي نَفْسِي بِيَدِهِ إِنَّهَا لَتَعْدِلُ ثُلُثَ الْقُرآنِ- يعني: قُلْ هُوَ اللهُ أَحَدٌ".