‘Abdullah bin Salam (May Allah be pleased with him) reported:
I heard the Messenger of Allah (ﷺ) saying, “O people, exchange greetings of peace (i.e., say: As-Salamu ‘Alaikum to one another), feed people, strengthen the ties of kinship, and be in prayer when others are asleep, you will enter Jannah in peace.”
[At- Tirmidhi, who classified it as Hasan Sahih].
The above is just a translation for the meaning in English, and in the following is the speech (Hadith) in Arabic:
وعن أبي يوسف عبد الله بن سلام رضي الله عنه قال: سمعت رسول الله صلى الله عليه وسلم يقول: “يا أيها الناس أفشوا السلام، وأطعموا الطعام، وصلوا الأرحام وصلوا والناس نيام، تدخلوا الجنة بسلام” ((رواه الترمذي وقال حديث حسن صحيح)).
Reference: Riyad as-Salihin 849, Book 5, Hadith 5.