Musnad Ahmad 33:822

Abu Nu'aym narrated to us, Sufyan narrated to us, from Abu al-Zubayr, from Jabir, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "Indeed, the throne of Iblis is upon the sea, so he sends out his detachments. The greatest of them in status to him is the greatest of them in causing tribulation."