(467) بَابُ
Abu Hurayra said, "The most miserly of people is the person whois miserly with the greeting. The one who is cheated of good is the onewho does not return it. if a tree comes between you and your brother, andyou are able to be the first to begin the greeting before the other person,then do it."
Reference: Al-Adab Al-Mufrad 1015
In-book reference: Book 42, Hadith 52
English translation: Book 42, Hadith 1015