Do not greet the Jews and the Christians before they greet you and when you meet any one of them on the roads force him to go to the narrowest part of it.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَبْدَءُوا الْيَهُودَ وَلاَ النَّصَارَى بِالسَّلاَمِ فَإِذَا لَقِيتُمْ أَحَدَهُمْ فِي طَرِيقٍ فَاضْطَرُّوهُ إِلَى أَضْيَقِهِ  

the Prophet ﷺ said, "If the people of the Scripture greet you, then you should say (in reply), 'Wa'alaikum (And on you).' "  

قَالَ النَّبِيُّ ﷺ إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الْكِتَابِ فَقُولُوا وَعَلَيْكُمْ  

Messenger of Allah 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).'"  

قَالَ رَسُولُ اللَّهِ ﷺ إِنَّ الْيَهُودَ إِذَا سَلَّمُوا عَلَى أَحَدِكُمْ إِنَّمَا يَقُولُونَ سَامٌ عَلَيْكَ فَقُلْ عَلَيْكَ  

that the Prophet ﷺ passed by a gathering in which the Muslims and the Jews were mixed, so he gave the Salam to them.  

أَخْبَرَهُ أَنَّ النَّبِيَّ ﷺ مَرَّ بِمَجْلِسٍ وَفِيهِ أَخْلاَطٌ مِنَ الْمُسْلِمِينَ وَالْيَهُودِ فَسَلَّمَ عَلَيْهِمْ