How to reply to a disbeliever if he says Salam to you

  1. إِذَا سَلَّمَ عَلَيْكُمْ أَهْلُ الكِتَابِ فَقُولُوا: (وَعَلَيْكُمْ)

    (When the people of the Book greet you, reply by saying: (And upon you.))