Riyad as-Salihin, Book 8, Hadith 989 (In-Book) ⓘ
Abu Hurairah (May Allah be pleased with him) reported: The Messenger of Allah said, "It is not permissible for a woman who believes in Allah and the Last Day to make a journey of one day and night unless she is accompanied by a Mahram (husband or any other relative to whom she is prohibited to marry)."[Al-Bukhari and Muslim].
عن أبي هريرة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم : "لا يحل لامرأة تؤمن بالله واليوم الآخر تسافر مسيرة يوم وليلة إلا مع ذي محرم عليها" ((متفق عليه)) .