(515) بَابُ: كَيْفَ الرَّدُّ عَلَى أَهْلِ الذِّمَّةِ؟
Ibn 'Abbas said, "Return the greeting to whomever it is, Jew,Christian, or Magian. That is because Allah says, 'When you are greetedwith a greeting, greet with one better than it or return it.' (4:
86)"
Reference: Al-Adab Al-Mufrad 1107
In-book reference: Book 44, Hadith 7
English translation: Book 44, Hadith 1107