Musnad Abu Ya'la al-Mawsili 78:4

Abu Khaythama narrated to us, Ismail narrated to us, from Ayyub, from Humayd ibn Hilal, from some of their elders, who said: Hisham ibn Amir said to his neighbors: "You are going to men who were neither more intimate with the Messenger of Allah (may Allah bless him and grant him peace) nor more retentive of his hadith than I am. I heard the Messenger of Allah (may Allah bless him and grant him peace) say: 'Between the creation of Adam and the establishment of the Hour, there is no creation greater than the Dajjal.'"