Abdullah reported: We were walking with Allahs Messenger ﷺ that Ibn Sayyad happened to pass by him. Allahs Messenger ﷺ said to him: I have concealed for you (something to test you, so tell me that). He said: It is Dukh. Thereupon Allahs Messenger ﷺ said to him: Be off. You cannot get farther than your rank, whereupon Umar said: Allahs Messenger, permit me to strike his neck. Thereupon Allahs Messenger ﷺ said: Leave him; if he is that one (Dajjal) whom you apprehend, you will not be able to kill him.