I heard Allah’s Messenger ﷺ delivering a sermon and making this observation:
“No person should be alone with a woman except when there is a mahram with her, and the woman should not undertake journey except with a mahram.”
A person stood up and said: Allah’s Messenger ﷺ, my wife has set out for pilgrimage, whereas I am enlisted to fight in such and such battle,
whereupon he ﷺ said:” You go and perform Hajj with your wife.”
[Sahih Muslim – Book 7 – Hadith 3110]
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