(2) باب فِي الْمَرْأَةِ تَحُجُّ بِغَيْرِ مَحْرَمٍ
Abu Sa'id reported The Apostel of Allah (SWAS) as saying:
A woman who believes in Allah and the Last Day must not make a journey of more than three days unless she is accompanied by her father or her brother, or her husband or her son or her relative who is within the prohibited degree.
Reference: Sunan Abi Dawud 1726
In-book reference: Book 11, Hadith 6
English translation: Book 10, Hadith 1722