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)‏‏)‏ ‏.‏
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Ibn 'Abbas (May Allah be pleased with them) reported

The Prophet (ﷺ) said, "No man must not be alone with a woman except in the presence of her (Mahram). No woman should travel except in company of a (Mahram)." A man said: "O Messenger of Allah! I have been enrolled for such and such expedition, and my wife left for Hajj." He (ﷺ) said to him, "Go and perform Hajj with your wife."[Al- Bukhari and Muslim].