Hadith 39:7
Anas b. Malik reported Allah's Messenger (ﷺ) as saying:
When the People of the Book offer you salutations, you should say: The same to you.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا هُشَيْمٌ، عَنْ عُبَيْدِ اللَّهِ بْنِ أَبِي بَكْرٍ، قَالَ سَمِعْتُ أَنَسًا، يَقُولُ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ح
Original Reference: Sahih Muslim 2163 a