Musannaf Ibn Abi Shayba 37:378

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Jabir, from ‘Abdullah ibn Naji, from ‘Ali, who said: We were sitting with the Prophet, may Allah bless him and grant him peace, while he was sleeping, and we mentioned the Dajjal. He woke up with his face reddened and said: "Other than the Dajjal, I fear for you more than the Dajjal: misleading leaders."