Musnad Ahmad 32:489

Zayd ibn al-Hubab narrated to us, he said: Husayn ibn Waqid narrated to me, Mu'adh ibn Harmalah al-Azdi narrated to me, he said: I heard Anas saying: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The Hour will not be established until the people are rained upon with a general rain, yet the earth does not cause anything to grow."