Musnad Ahmad 1153:457

'Abd al-Samad narrated to us, Hammad narrated to us, he said: 'Ali ibn Zayd narrated to us, from al-Hasan, from 'A'ishah, that the Messenger of Allah (peace and blessings of Allah be upon him) mentioned a hardship that would occur before the Dajjal. They said: "Which wealth is best on that day?" He said: "A strong boy who gives his family water to drink, as for food, there is none." They said: "Then what is the food of the believers on that day?" He said: "Glorifying Allah (Tasbih), magnifying Allah (Takbir), praising Allah (Tahmid), and declaring the oneness of Allah (Tahlil)." 'A'ishah said: "Then where are the Arabs on that day?" He said: "The Arabs on that day are few."