Narrator:Anas ibn Mālik
وعن أنس رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم: "إذا سلم عليكم أهل الكتاب فقولوا: وعليكم” ((متفق عليه))
Anas (May Allah be pleased with him) reported:
Messenger of Allah (ﷺ) said, "When the people of the Book greet you, respond with: 'Wa 'alaikum' (And upon you)".
[Al-Bukhari and Muslim].
Reported by Al-Bukhari (No. 6258, 6926), Muslim (No. 2163a), At-Tirmidhi (No. 3301), Ibn Majah (No. 3697) and Ahmad (No. 11510, 11977, 12011, 12734, 12763, 12807, 12976, 13267). Cited in Riyad as-Salihin (No. 867).