Musnad Ahmad 626:34

Yazid narrated to us, he said: Isma'il ibn Abi Khalid informed us, from Qays ibn Abi Hazim, from al-Mughirah ibn Shu'bah, who said: No one asked the Messenger of Allah, peace and blessings of Allah be upon him, about the Dajjal more than I asked him about him. He said to me: "O my son, what troubles you about him? He will not harm you." I said: "O Messenger of Allah, they claim that he has mountains of bread and rivers of water with him." He said: "He is more insignificant to Allah, the Almighty and Majestic, than that."