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