Riyad as-Salihin #340
The Book of Virtues
Ubayy bin Ka'b (May Allah be pleased with him) reported: The Messenger of Allah (ﷺ) said: "Abu Mundhir! Do you know which Ayah in Allah's Book is the greatest?" I replied: "It is 'Allah la ilaha illa Huwal-Haiyul-Qayum (Allah! none has the right to be worshipped but He, the Ever Living...)'." (2:256) Thereupon he (ﷺ) patted me in the chest and said, "Rejoice by this knowledge, O Abu Mundhir!".
Narrated by Ubayy bin Ka'b (May Allah be pleased with him) reported:
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About Riyad as-Salihin
This hadith is #340 from Riyad as-Salihin, in the Book of The Book of Virtues and narrated by Ubayy bin Ka'b (May Allah be pleased with him) reported:. Riyad as-Salihin contains 1,896 hadiths across 20 books.