[1] There is great similarity between the pronunciations of the Arabic words meaning "peace" and "death". The first is As-Salamu and the second is As-Sámu.The Jews, instead of saying "As-Salámu 'Alaikum" said, 'As-Sdmu Alaikum ', intending to invoke evil upon the Prophet (ﷺ) rather than to greet him, but the Prophet (ﷺ) noticed what they had said and invoked evil upon them in his turn. They were the losers, for Allah would accept the Prophet's invocation and reject theirs.