كتاب الأدب
Read the English translation first, with the original Arabic directly underneath.
It was narrated from Abu 'Abdur-Rahman Al Juhani that the Messenger of Allah(ﷺ) said:
"I am riding to the Jews tomorrow. Do not initiate the greeting with them, and if they greet you, then say: Wa 'alaikum (and also upon you)".
إِنِّي رَاكِبٌ غَدًا إِلَى الْيَهُودِ فَلاَ تَبْدَءُوهُمْ بِالسَّلاَمِ فَإِذَا سَلَّمُوا عَلَيْكُمْ فَقُولُوا وَعَلَيْكُمْ