Musannaf Ibn Abi Shayba 37:384

Abu al-Muwarra' narrated to us, [he said] al-Ajlah narrated to us, from Qays ibn Abi Muslim, from Rib'i ibn Hirash: He said: I heard Hudhayfah say: "If the Dajjal were to emerge, a people in their graves would believe in him."