It is narrated on the authority of 'Abdullah b. 'Amr that a man asked the Messenger of Allah (ﷺ) which of the merits (is superior) in Islam. He (the Holy Prophet) remarked:
That you provide food and extend greetings to one whom you know or do not know.
Reference: Sahih Muslim 39 In-book : Book 1, Hadith 67 USC-MSA web (English) : Book 1, Hadith 63 (deprecated)
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