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»
The Messenger of Allah (sallallahu alayhi wa sallam) 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).”.
Riyad as-Salihin 989, Book 8, The Book of Etiquette of Traveling, Hadith 34. 1 min read