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