‏الفتن وأشراط الساعة‏ : Hadeeth No:7007 Anas b. Malik reported that Allaah's Messenger (sallAllaahu alayhi wa sallam) said: There is never a prophet who has not warned the Ummah of that one-eyed liar; behold he is one-eyed and your Lord is not one-eyed. On his forehead are the letters k f. r. (Kafir)....

‏السلام : Hadeeth No:5559 Abu Sa'id Khudri reported Allaah's Messenger having said: There is a group of jinns in Medina who accepted Islam, so he who would see anything from these occupants should warn him three times; and if he appears after that, he should kill him for he is a satan....