Musnad Ahmad 298:17

Ahmad ibn Abd al-Malik narrated to us, he said: Hammad—meaning Ibn Zayd—narrated to us, from Ayyub, from Humayd ibn Hilal, from Abu al-Dahma’, from Hisham ibn Amir, who said: You go to a group of the companions of the Prophet, may Allah bless him and grant him peace, who were neither more numerous nor more retentive of his hadith than I. And I heard the Messenger of Allah, may Allah bless him and grant him peace, say: "There is no matter between [the creation of] Adam and the Day of Resurrection greater than the Dajjal."