When the People of the Book offer you salutations, you should say: The same to you.

When the Jews offer you salutations, some of them say as-Sam-u-'Alaikum (death be upon you). You should say (in response to it): Let it be upon you.

As-Sam-u-'Alaikum. A'isha said in response: As-Sam-u-'Alaikum (death be upon you) and curse also, whereupon Allah's Messenger (ﷺ) said: 'A'isha, verily Allah loves kindness in every matter. She said: Did you bear what they said? Thereupon he said: Did you not hear that I said (to them): Wa 'Alaikum.

Wa 'Alaikum, A'isha was enraged and asked him (Allah's Apostle) whether he had not heard what they had said. He said, I did hear and I retorted to them (and the curse that I invoked upon them would receive response from Allah), but (the curse that they invoked upon us) would not be responded.

Do not greet the Jews and the Christians before they greet you and when you meet any one of them on the roads force him to go to the narrowest part of it.