That the Messenger of Allah ﷺ said: "Do not precede the Jews and the Christians with the Salam. And if one you meets one of them in the path, then force him to its narrow portion." [He said:] There are narrations on this topic from Ibn 'Umar, Anas, and Abu Basrah Al-Ghifari the Companion of the Prophet ﷺ.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَبْدَءُوا الْيَهُودَ وَالنَّصَارَى بِالسَّلاَمِ وَإِذَا لَقِيتُمْ أَحَدَهُمْ فِي الطَّرِيقِ فَاضْطَرُّوهُمْ إِلَى أَضْيَقِهِ قَالَ وَفِي الْبَابِ عَنِ ابْنِ عُمَرَ وَأَنَسٍ وَأَبِي بَصْرَةَ الْغِفَارِيِّ صَاحِبِ النَّبِيِّ ﷺ  

That the Messenger of Allah ﷺ said: "Indeed when a Jew gives Salam to one of you, then he is only saying: 'As-Samu 'Alaikum' (Death be upon you) so say: "Alaik (And upon you).'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الْيَهُودَ إِذَا سَلَّمَ عَلَيْكُمْ أَحَدُهُمْ فَإِنَّمَا يَقُولُ السَّامُ عَلَيْكُمْ فَقُلْ عَلَيْكَ