Dua #1094•Al-Bukhari, cf. Al-Asqalani, Fathul-Bari 1/55, Muslim 1/65.

Excellence of spreading the Islamic greeting

Hisnul Muslim
#1094

وَعَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ رَضِيَ اللَّهُ عَنْهُمَا: أنَّ رَجُلاً سَأَلَ النَّبِيَّ صلى الله عليه وسلم أيُّ الْإِسْلاَمِ خَيْرٌ قَالَ: (تُطْعِمُ الطَّعَامَ وَتَقْرأُ السَّلاَمَ عَلَى مَنْ عَرَفْتَ وَمَنْ لَمْ تَعْرِفْ)

Translation

Narrated 'Abdullah bin 'Amr: A man asked the Prophet (ﷺ) , "What sort of deeds or (what qualities of) Islam are good?" The Prophet (ﷺ) replied, 'To feed (the poor) and greet those whom you know and those whom you do not Know (See Hadith No)