A Jew passed by Messenger of Allah ﷺ and said, "As-Samu 'Alaika." Messenger of Allah ﷺ said in reply, "We 'Alaika." Messenger of Allah ﷺ then said to his companions, "Do you know what he (the Jew) has said? He said, 'As-Samu 'Alaika.'" They said, "O Messenger of Allah ﷺ! Shall we kill him?" The Prophet, said, "No. When the people of the Book greet you, say: 'Wa 'Alaikum.'"  

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ يَقُولُ مَرَّ يَهُودِيٌّ بِرَسُولِ اللَّهِ ﷺ فَقَالَ السَّامُ عَلَيْكَ فَقَالَ رَسُولُ اللَّهِ ﷺ وَعَلَيْكَ فَقَالَ رَسُولُ اللَّهِ ﷺ أَتَدْرُونَ مَا يَقُولُ قَالَ السَّامُ عَلَيْكَ قَالُوا يَا رَسُولَ اللَّهِ أَلاَ نَقْتُلُهُ قَالَ لاَ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ  

[Machine] A Jewish man passed by the Messenger of Allah ﷺ and said, "Assalamu alaikum," (peace be upon you). The Messenger of Allah ﷺ replied, "Wa alaikum assalam. Do you know what he said?" They said, "He said, 'Assalamu alaikum' to you," The Messenger of Allah ﷺ said, "Should we not kill him?" They replied, "No, but when the people of the book greet you with 'Assalamu alaikum,' you should reply with 'Wa alaikum assalam.'"  

أَنَّ يَهُودِيًّا مَرَّ عَلَى رَسُولِ اللهِ ﷺفَقَالَ السَّامُ عَلَيْكَ فَقَالَ رَسُولُ اللهِ ﷺ وَعَلَيْكَ أَتَدْرُونَ مَا قَالَ؟ قَالَ السَّامُ عَلَيْكُمْ فَقَالُوا أَلَا نَقْتُلُهُ فَقَالَ لَا وَلَكِنْ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ  

[Machine] "A Jew greeted the Messenger of Allah ﷺ and said 'As-Salamu Alaikum' (peace be upon you). The Prophet ﷺ responded by saying 'Return the greeting to me'. The Jew asked, 'Did you say As-Salamu Alaikum (peace be upon you)?' The Prophet ﷺ replied, 'Yes'. Then the Messenger of Allah ﷺ said, 'When anyone from the People of the Book greets you with Salam, say 'Wa Alaikum' (and upon you).'  

أَنَّ يَهُودِيًّا سَلَّمَ عَلَى رَسُولِ اللهِ ﷺ فَقَالَ السَّامُ عَلَيْكَ قَالَ رُدُّوهُ عَلَيَّ قَالَ أَقُلْتَ السَّامُ عَلَيْكَ؟ قَالَ نَعَمْ فَقَالَ رَسُولُ اللهِ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَحَدٌ مِنْ أَهْلِ الْكِتَابِ فَقُولُوا وَعَلَيْكَ  

[Machine] "About the Prophet ﷺ, when a Jew greets you with the word 'As-salamu alaykum', he is only saying 'death be upon you,' so respond with 'wa alaykum' (and upon you). And he also mentioned once, when the Jews greet you, say 'wa alaykum' (and upon you), as they are saying 'death be upon you.'"  

عَنِ النَّبِيِّ ﷺ إِذَا سَلَّمَ عَلَيْكَ الْيَهُودِيُّ فَإِنَّمَا يَقُولُ السَّامُ عَلَيْكَ فَقُلْ وَعَلَيْكَ وَقَالَ مَرَّةً إِذَا سَلَّمَ عَلَيْكُمُ الْيَهُودُ فَقُولُوا وَعَلَيْكُمْ فَإِنَّهُمْ يَقُولُونَ السَّامُ عَلَيْكُمْ  

[Machine] "A Jew greeted the Prophet ﷺ and his companions, saying, 'As-salamu 'alaykum' (peace be upon you). The Prophet ﷺ asked, 'Do you know what he said?' They replied, 'Yes, he greeted us by saying 'as-salamu 'alaykum.' The Prophet ﷺ said, 'No, he actually said 'as-samu 'alaykum' (death be upon you), meaning that you should abandon your religion. So when a person from the People of the Book greets you, respond by saying 'wa 'alayk' (and upon you).'"  

أَنَّ يَهُودِيًّا سَلَّمَ عَلَى النَّبِيِّ ﷺ وَأَصْحَابِهِ فقَالَ السَّامُ عَلَيْكُمْ فقَالَ النَّبِيُّ ﷺ «أَتَدْرُونَ مَا قَالَ؟ » قَالُوا نَعَمْ سَلَّمَ عَلَيْنَا قَالَ «لَا إِنَّمَا قَالَ السَّامُ عَلَيْكُمْ أَيْ تُسَامُونَ دِينَكُمْ فَإِذَا سَلَّمَ عَلَيْكُمْ رَجُلٌ مِنْ أَهْلِ الْكِتَابِ فَقُولُوا وَعَلَيْكَ»  

[Machine] "A Jew passed by the Prophet ﷺ and said 'as-salamu 'alaykum' (peace be upon you). Umar said, 'O Messenger of Allah, shall I strike his neck?' He said, 'No, if they greet you with peace, then say 'wa 'alaykum.'"  

أَنَّ يَهُودِيًّا مَرَّ عَلَى النَّبِيِّ ﷺ فَقَالَ السَّامُ عَلَيْكُمْ فَقَالَ عُمَرُ يَا رَسُولَ اللهِ ألَا أَضْرِبُ عُنُقَهُ؟ فَقَالَ لَا إِذَا سَلَّمُوا عَلَيْكُمْ فَقُولُوا وَعَلَيْكُمْ  

"أتدرون ما قال؟ قالوا: سلَّم علينا، قال: لا، إنما قال: السَّأمُ عليكم - أى تسأمون دينكم - فإذا سلم عليكم رجل من أهل الكتاب فقولوا: وعليك".