(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)." (ES)
Reference (ES): Sunan Ibn Majah 3697 (ES)
In-book reference (ES): Book 33, Hadith 41 (ES)
English translation (ES): Vol. 5, Book 33, Hadith 3697 (ES)