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