Allah's Messenger (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).'"
Regarding Al-Harauriyya: The Prophet (ﷺ) said, "They will go out of Islam as an arrow darts out of the game's body.'