What did the Prophet Muhammad (saw) say should be our response when the Jews greet us with 'As-Samu 'alaikum'?
 Narrated `Abdullah bin `Umar:                     Allah's Apostle said, "When the Jews greet you, they usually say, 'As-Samu 'alaikum (Death be on you),' so you should say (in reply to them), 'Wa'alaikum (And on you).