(13) باب رَدِّ السَّلاَمِ عَلَى أَهْلِ الذِّمَّةِ
It was narrated that Anas bin Malik said "the Messenger of Allah(ﷺ) said":
"When any of the People of the Book greets you with Salam (peace), then say, Wa 'alaikum(and also upon you)." (RU)
Reference (RU): Sunan Ibn Majah 3697 (RU)
In-book reference (RU): Book 33, Hadith 41 (RU)
English translation (RU): Vol. 5, Book 33, Hadith 3697 (RU)