It was narrated that ‘Abdullah bin Salam said:
“When the Messenger of Allah ﷺ came to Al-Madinah, the people rushed towards him and it was said: ‘The Messenger of Allah ﷺ has come!’ I came along with the people to see him, and when I looked at the face of the Messenger of Allah ﷺ, I realized that his face was not the face of a liar. The first thing he said was: “O people, spread (the greeting of) Salam, offer food to people and pray at night when people are sleeping, you will enter Paradise in peace.”

حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، وَابْنُ أَبِي عَدِيٍّ، وَعَبْدُ الْوَهَّابِ، وَمُحَمَّدُ بْنُ جَعْفَرٍ، عَنْ عَوْفِ بْنِ أَبِي جَمِيلَةَ، عَنْ زُرَارَةَ بْنِ أَوْفَى، عَنْ عَبْدِ اللَّهِ بْنِ سَلاَمٍ، قَالَ لَمَّا قَدِمَ رَسُولُ اللَّهِ ـ ﷺ ـ الْمَدِينَةَ انْجَفَلَ النَّاسُ إِلَيْهِ . وَقِيلَ قَدِمَ رَسُولُ اللَّهِ ـ ﷺ ـ . فَجِئْتُ فِي النَّاسِ لأَنْظُرَ إِلَيْهِ فَلَمَّا اسْتَبَنْتُ وَجْهَ رَسُولِ اللَّهِ ـ ﷺ ـ عَرَفْتُ أَنَّ وَجْهَهُ لَيْسَ بِوَجْهِ كَذَّابٍ فَكَانَ أَوَّلَ شَىْءٍ تَكَلَّمَ بِهِ أَنْ قَالَ " يَا أَيُّهَا النَّاسُ أَفْشُوا السَّلاَمَ وَأَطْعِمُوا الطَّعَامَ وَصَلُّوا بِاللَّيْلِ وَالنَّاسُ نِيَامٌ تَدْخُلُوا الْجَنَّةَ بِسَلاَمٍ " .