Musannaf Ibn Abi Shayba 17:1253

Yazid ibn Harun narrated to us, he said: Isma'il narrated to us, from Qays, from al-Mughira ibn Shu'ba, who said: No one asked the Messenger of Allah, may Allah bless him and grant him peace, about the Dajjal more than I asked him. He said: "O my son, and what will it harm you [to know] about him?"