Musnad Ahmad 32:1622

'Affan and Bahz narrated to us, they said: Hammam narrated to us, Qatadah informed us, from Anas ibn Malik, that a man came to the Prophet, may Allah bless him and grant him peace, while he was on the pulpit, and said: "O Messenger of Allah, ask Allah to send us rain." He said: "So he asked for rain, and we did not see a single patch of cloud in the sky." He said: "Then it rained upon us, and it did not cease." When the following Friday came, that man or someone else stood up to him and said: "O Messenger of Allah, pray to Allah to lift it from us." He said: "So he prayed, and I began to look at the clouds clearing to the right and to the left, and not a single drop fell from its center."