Abu Hurayra reported that the Prophet (ﷺ) said, "You will not enter the Garden until you believe and you will not believe until you love one another. Shall I tell you something the doing of which will give you love of one another?" "Yes, Messenger of Allah," they replied. The Prophet said, "Make the greeting common practice among you."
Reference: Al-Adab Al-Mufrad 980 In-book : Book 42, Hadith 16 English translation : Book 42, Hadith 980
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