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