(512) بَابُ إِذَا كَتَبَ الذِّمِّيُّ فَسَلَّمَ، يُرَدُّ عَلَيْهِ
Abu 'Uthman an-Nahdi said, "Abu Musa wrote to a Persian grandeeand greeted him in his letter. He was asked, 'Do you greet him when heis an unbeliever?' He replied, 'He wrote to me and greeted me, so I haveanswered him.'" (IT)
Reference (IT): Al-Adab Al-Mufrad 1101 (IT)
In-book reference (IT): Book 44, Hadith 1 (IT)
English translation (IT): Book 44, Hadith 1101 (IT)