‘Abdallah b. Salam said: When the Prophet (ﷺ) came to Medina and I went and examined his face, I recognised that it was not the face of a liar. The first thing he said was, “If you people greet all whom you meet, provide food, care for the wellbeing of your kindred, and pray at night when people are asleep, you will enter paradise in peace.’’ Tirmidhi, Ibn Majah and Darimi transmitted it.
Source: sunnah.com
Other translations
Arabic
عَنْ عَبْدِ اللَّهِ بْنِ سَلَامٍ قَالَ: لَمَّا قَدِمَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ الْمَدِينَةَ جِئْتُ فَلَمَّا تَبَيَّنْتُ وَجْهَهُ عَرَفْتُ أَنَّ وَجْهَهُ لَيْسَ بِوَجْهِ كَذَّابٍ. فَكَانَ أَوَّلُ مَا قَالَ: «أَيُّهَا النَّاسُ أَفْشُوا السَّلَامَ وَأَطْعِمُوا الطَّعَامَ وَصِلُوا الْأَرْحَامَ وَصَلُّوا بِاللَّيْلِ وَالنَّاسُ نِيَامٌ تَدْخُلُوا الْجَنَّةَ بِسَلام» . رَوَاهُ التِّرْمِذِيّ وَابْن مَاجَه والدارمي
sunnah.com