Musannaf Ibn Abi Shayba 37:410

Abdullah ibn Numayr narrated to us, he said: Hallam ibn Salih narrated to us, from Sulayman ibn Shihab al-Absi, he said: Abdullah ibn Nu'aym informed me, and he mentioned the Dajjal and said: "He is not hidden, and what is before him of tribulation is more fearful to you than the Dajjal. Indeed, the Dajjal has no hiddenness in him. Indeed, the Dajjal calls to a matter that people recognize, until they see that from him."