(4) باب إِذَا عَرَّضَ الذِّمِّيُّ وَغَيْرُهُ بِسَبِّ النَّبِيِّ صلى الله عليه وسلم وَلَمْ يُصَرِّحْ نَحْوَ قَوْلِهِ السَّامُ عَلَيْكَ
Narrated Ibn `Umar:
Allah's Messenger (ﷺ) said, "When the Jews greet anyone of you they say: 'Sam'Alaika (death be upon you); so you should say; 'Wa 'Alaika (and upon you).'"
Reference: Sahih al-Bukhari 6928
In-book reference: Book 88, Hadith 10
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 84, Hadith 62