Al-Adab Al-Mufrad #1120
Letters
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عَلِيُّ بْنُ حُجْرٍ، قَالَ: أَخْبَرَنَا شَرِيكٌ، عَنِ الْعَبَّاسِ بْنِ ذَرِيحٍ، عَنْ عَامِرٍ، عَنِ ابْنِ عَبَّاسٍ قَالَ: إِنِّي لَأَرَى لِجَوَابِ الْكِتَابِ حَقًّا كَرَدِّ السَّلامِ.
Ibn 'Abbas said, "I think that answering a letter is a duty, just
like returning the greeting."
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About Al-Adab Al-Mufrad
This hadith is #1120 from Al-Adab Al-Mufrad, in the Book of Letters.