Zuhayr ibn Harb narrated to me: Yahya ibn Sa'id narrated to us, from Ibn Abi Dhi'b, from Sa'id ibn Abi Sa'id, from his father, from Abu Hurayrah, from the Prophet (peace be upon him), who said: "It is not lawful for a woman who believes in Allah and the Last Day to travel the distance of one day's journey except with a mahram."