Allah's Messenger (ﷺ) said: O Abu ' al-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah and His Apostle (ﷺ) know best. He again said: Abu 'l-Mundhir, do you know the verse from the Book of Allah which, according to you, is the greatest? I said: Allah, there is no god but He, the Living, the Eternal. Thereupon he struck me on my breast and said: May knowledge be pleasant for you, O Abu 'l-Mundhir!
Reference: Sahih Muslim 810 In-book : Book 6, Hadith 313 USC-MSA web (English) : Book 4, Hadith 1768 (deprecated)
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