This hadith has been narrated on the authority of Ibn 'Umar through another chain of transmitters with a slight variation of wording.
Sahih Muslim Book 39, Hadith 10
← Previous Hadith 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.

Sahih Muslim Book 39, Hadith 9 Next Hadith → 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.

Sahih Muslim Book 39, Hadith 11