Bismillah Walhamdulillah Was Salaatu Was Salaam ‘ala Rasulillah
Narrated ‘Abdullah bin ‘Amr (Radi-Allahu ‘anhu):
A man asked the Prophet (Sallallahu ‘Alaihi Wa Sallam), “What Islamic traits are the best?” The Prophet (Sallallahu ‘Alaihi Wa Sallam) said, "Feeding the people, and greeting those whom you know and those whom you do not know.“
Bukhari Vol. 8 : No. 253