(521) بَابُ إِذَا سَلَّمَ عَلَى النَّصْرَانِيِّ وَلَمْ يَعْرِفْهُ
'Abdu'r-Rahman said, "Ibn 'Umar passed by a Christian who greetedhim and Ibn 'Umar returned the greeting He was told that the man was aChristian. When he learned that, he went back to him and said, 'Give meback my greeting.'"
Reference: Al-Adab Al-Mufrad 1115
In-book reference: Book 44, Hadith 15
English translation: Book 44, Hadith 1115