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The Prophet (ﷺ) said: "You shall not enter Paradise until you believe, and you have not believed until you love one another. Shall I tell you of something you can do to make you love one another? Spread the greetings of Salam (peace) amongst yourselves (i.e. between each other).
Reference:
Muslim 1/74 and others.
Three characteristics, whoever combines them, has completed his faith: to be just, to spread greetings to all people and to spend (charitably) out of the little you have.
Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 1/82 as a statement of the
Companion 'Ammar (RA).
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`Abdullah bin `Umar (RA) said: A man asked the Prophet (ﷺ), "What is the best act of Islam?" He said, "To feed others and to give greetings of Salam (peace) to those whom you know and to those whom you do not know. "
Reference:
Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 1/55, Muslim 1/65.
