Abu Hurairah reported the Messenger of Allah (ﷺ) as saying:
By him in whose hand my soul is, you will not enter Paradise until you believe, and you will not believe until you love one another: should I not guide you to something doing which you will love one another: spread out salutation among you.
Reference: Sunan Abi Dawud 5193 In-book : Book 43, Hadith 421 English translation : Book 42, Hadith 5174
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