عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو ـ رضى الله عنهما ـ أَنَّ رَجُلاً، سَأَلَ النَّبِيَّ صلى الله عليه وسلم أَىُّ الإِسْلاَمِ خَيْرٌ قَالَ ‏ “‏ تُطْعِمُ الطَّعَامَ، وَتَقْرَأُ السَّلاَمَ عَلَ

Sahih al-Bukhari 12

Narrated ‘Abdullah bin ‘Amrؓ that a man asked the Prophetﷺ , “What sort of deeds in Islam are good?” The Prophetﷺ replied, ‘To feed (the poor) and greet those whom you know and those whom you do not Know.