Musnad Abu Ya'la al-Mawsili 150:103

Abdullah ibn Mu'awiyah narrated to us, Hammad ibn Salamah narrated to us, Ali ibn Zayd narrated to us, from al-Hasan, from Aisha, that the Messenger of Allah (peace be upon him) mentioned a severe hardship that will occur before the Dajjal. I said, "O Messenger of Allah, where will the Arabs be on that day?" He said, "O Aisha, the Arabs will be few on that day." I said, "What will suffice the believer for food on that day?" He said, "Glorifying Allah (Tasbih), declaring His oneness (Tahlil), and declaring His greatness (Takbir)." I said, "What wealth will be best on that day?" He said, "A servant who provides his family with water. As for food, there will be no food."