Musannaf Ibn Abi Shayba 2:256

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from al-A'mash, from Abu Sufyan, from Jabir, who said: The Prophet, may Allah bless him and grant him peace, said: "When the caller to prayer (mu'adhdhin) calls, the devil flees until he is at al-Rawha." And it is thirty miles from Medina.