It is narrated from Hazrat Hudhaifa (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: I know well the deception that will be with the Dajjal. He will have a blazing fire and a river of cool water with him. So if any of you encounters him, do not be destroyed by it; close your eyes and jump into what you think is fire, for surely it will be cool water.