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