Sabrah bin Ma'bad said: The Companions of the Prophet (peace and blessings be upon him) saw a cloud and said: "O Messenger of Allah! We hope that rain will fall upon us from this cloud." The Prophet (peace and blessings be upon him) said: "It has been commanded to rain upon 'Bulayl'." The narrator said: The Prophet (peace and blessings be upon him) meant a valley whose name was "Bulayl".
Al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators have been declared trustworthy.