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. 27).  

أَنَّ رَجُلاً سَأَلَ النَّبِيَّ ﷺ أَىُّ الإِسْلاَمِ خَيْرٌ قَالَ تُطْعِمُ الطَّعَامَ وَتَقْرَأُ السَّلاَمَ عَلَى مَنْ عَرَفْتَ وَمَنْ لَمْ تَعْرِفْ  

Some people asked Messenger of Allah ﷺ, "Whose Islam is the best? i.e. (Who is a very good Muslim)?" He replied, "One who avoids harming the Muslims with his tongue and hands."  

قَالُوا يَا رَسُولَ اللَّهِ أَىُّ الإِسْلاَمِ أَفْضَلُ قَالَ مَنْ سَلِمَ الْمُسْلِمُونَ مِنْ لِسَانِهِ وَيَدِهِ