Chapter 40: The Book of Greetings
' A' isha reported that a group of Jews came to Allah' s Messenger (ﷺ) 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 (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 2165a