(22) باب كَيْفَ يُرَدُّ عَلَى أَهْلِ الذِّمَّةِ السَّلاَمُ
Narrated Anas bin Malik:
the Prophet (ﷺ) said, "If the people of the Scripture greet you, then you should say (in reply), 'Wa'alaikum (And on you).' "
Reference: Sahih al-Bukhari 6258
In-book reference: Book 79, Hadith 32
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 8, Book 74, Hadith 275