Yahya related to me from Malik from Abdullah ibn Dinar that Abdullah ibn Umar said that the Messenger of Allah, may Allah bless him and grant him peace, said, "When a jew greets you, and says Death to you (as-samu alaykum) say, And to you. " Yahya said, "Malik was asked whether a person who greeted a jew or christian, should apologise for it. He said, No."