Abdu'r-Rahman said, "Ibn 'Umar passed by a Christian who greeted him and Ibn 'Umar returned the greeting He was told that the man was a Christian. When he learned that, he went back to him and said, 'Give me back my greeting.'"
Reference: Al-Adab Al-Mufrad 1115 In-book : Book 44, Hadith 15 English translation : Book 44, Hadith 1115
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