Yahya ibn Yahya narrated to us, Hushaim informed us, from Ubaydullah ibn Abi Bakr, who said: I heard Anas say: The Messenger of Allah, peace and blessings be upon him, said...
And Isma'il ibn Salim narrated to me, Hushaim narrated to us, Ubaydullah ibn Abi Bakr informed us, from his grandfather Anas ibn Malik, that the Messenger of Allah, peace and blessings be upon him, said:
"If the People of the Book greet you, then say: 'And upon you.'"

Anas reported that the Companions of Allah's Apostle ( صلی اللہ علیہ وسلم ) said to him: The People of the Book offer us salutations (by saying as-Salamu-'Alaikum). How should we reciprocate them? Thereupon he said: Say: Wa 'Alaikum (and upon you too).

Ibn 'Umar reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: 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.

This hadith has been narrated on the authority of Ibn 'Umar through another chain of transmitters with a slight variation of wording.

'A'isha reported that a group of Jews came to Allah's Messenger ( صلی اللہ علیہ وسلم ) and sought his audience and said: As-Sam-u-'Alaikum. A'isha said in response: As-Sam-u-'Alaikum (death be upon you) and curse also, whereupon Allah's Messenger ( صلی اللہ علیہ وسلم ) said: 'A'isha, verily Allah loves kindness in every matter. She said: Did you hear what they said? Thereupon he said: Did you not hear that I said (to them): Wa 'Alaikum.

This hadith has been transmitted on the authority of Zuhri that Allah's Messenger ( صلی اللہ علیہ وسلم ) said: I said 'Alaikam, and the transmitter did not make mention of the word "and".

'A'isha reported that some Jews came to Allah's Apostle ( صلی اللہ علیہ وسلم ) and they said: Abu'l-Qasim (the Kunya of the Holy Prophet), as-Sam-u-'Alaikum, whereupon he (the Holy Prophet) said: Wa 'Alaikum. A'isha reported: In response to these words of theirs, I said: But let there be death upon you and disgrace also, whereupon Allah's Messenger ( صلی اللہ علیہ وسلم ) said: 'A'isha, do not use harsh words. She said: Did you hear what they said? Thereupon he (the Holy Prophet) said: Did I not respond to them when they said that; I said to them: Wa'Alaikum (let it be upon you).

This hadith has been reported on the authority of A'znash with a slight variation of wording. 'A'isha understood their meaning and cursed them and Allah's Messenger ( صلی اللہ علیہ وسلم ) said: 'A'isha. (do not do that) for Allah does not like the use of harsh words, and it was at this stage that this verse of Allah, the Exalted and Glorious was revealed: "And when they come to thee, they greet thee with a greeting with which Allah greets thee not" (Iviii. 8) to the end of the verse.

Jabir bin'Abdullah (RA) reported that some people from amongst the Jews said to Allah's Messenger ( صلی اللہ علیہ وسلم ) Abu'l-Qasim as-Sam-u-'Alaikum, whereupon he said: Wa 'Alaikum. A'isha was enraged and asked him (Allah's Apostle) ( صلی اللہ علیہ وسلم ) 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.

Abu Hurairah (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: 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.