Musnad Abu Ya'la al-Mawsili 115:263

Zuhayr narrated to us, Affan narrated to us, Hammam narrated to us, from Qatadah, from Anas, 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." So he asked for rain, and we did not see a single cloud in the sky. Then it rained, and it did not cease to pour until its two lava fields (the eastern and western outskirts of Medina) were flooded. When the following Friday came, that man—or someone else—stood up to him and said: "Call upon Allah to stop it." He said: "So I began to look at the clouds splitting to the north and to the south around Medina, and not a single drop fell within its center."