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