(475) بَابُ مَنْ لَمْ يَرُدَّ السَّلامَ
Al-Hasan said, "Greeting is an act of obedience while the answeris a duty." (IT)
Reference (IT): Al-Adab Al-Mufrad 1040 (IT)
In-book reference (IT): Book 42, Hadith 77 (IT)
English translation (IT): Book 42, Hadith 1040 (IT)