사히흐 알부하리 #28
Sahih (Authentic)
A person asked Allah's Messenger (ﷺ), "What (sort of) deeds in or (what qualities of) Islam are good?" He replied, "To feed (the poor) and greet those whom you know and those whom you don't know
전승 사슬 (이스나드)
Narrated 'Abdullah bin 'Amr