[Machine] While the Messenger of Allah ﷺ was sitting with his companions, a Jew passed by them and greeted them. After he passed, the Prophet called him and asked, "What did you say?" The Jew replied, "I said 'death be upon you.'" The Messenger of Allah ﷺ said, "When anyone from the People of the Book greets you, respond with 'and upon you' whatever you said."
بَيْنَمَا رَسُولُ اللهِ ﷺ قَاعِدًا فِي أَصْحَابِهِ إِذْ مَرَّ بِهِمْ يَهُودِيٌّ فَسَلَّمَ فَلَمَّا مَضَى دَعَاهُ فَقَالَ كَيْفَ قُلْتَ؟ قَالَ قُلْتُ سَامٌ عَلَيْكُمْ فَقَالَ رَسُولُ اللهِ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَحَدٌ مِنْ أَهْلِ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ أَيْ مَا قُلْتُمْ