عَنْ أَبِي عَبْدِ الرَّحْمَنِ الْجُهَنِيِّ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ إِنِّي رَاكِبٌ غَدًا إِلَى يَهُودٍ فَلَا تَبْدَءُوهُمْ بِالسَّلَامِ فَإِذَا سَلَّمُوا عَلَيْكُمْ فَقُولُوا وَعَلَيْكُمْ
Sayyiduna Abu Abdur Rahman Juhani (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: Tomorrow I will go to the Jews riding (my mount), you must not initiate greeting them with salam, and when they greet you with salam, you should only say: "Wa 'alaykum."