Al-Adab Al-Mufrad #1043
Greetings
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، قَالَ: حَدَّثَنَا سُفْيَانُ، عَنْ هِشَامٍ، عَنِ الْحَسَنِ قَالَ: التَّسْلِيمُ تَطَوَّعٌ، وَالرَّدُّ فَرِيضَةٌ.
Al-Hasan said, "Greeting is an act of obedience while the answer
is a duty."
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About Al-Adab Al-Mufrad
This hadith is #1043 from Al-Adab Al-Mufrad, in the Book of Greetings.