Musannaf Ibn Abi Shayba 37:365

Husayn ibn Ali narrated to us, from Za'idah, from Mansur, from Rib'i, from Hudhayfah, from the Prophet (peace be upon him), who said: "I am more knowledgeable of what is with the Dajjal than the Dajjal himself. With him is a fire that burns and a river of cold water. So whoever among you reaches him, let him not perish by it; let him close his eyes and fall into that which he sees as fire, for it is a river of cold water."