Ibn 'Abbas (RAA) narrated, ‘I heard the Messenger of Allah ( صلی اللہ علیہ وسلم ) saying,“A man must never be alone with a woman unless there is a Mahram with her. A woman also may not travel with anyone except with a Mahram (relative).”A man stood up and asked, ‘O Messenger of Allah! My wife has gone for Hajj while I am enlisted for such and such a battle, what should I do?’ The Messenger of Allah ( صلی اللہ علیہ وسلم ) replied,“Go and join your wife in Hajj." Agreed upon, and the wording is from Muslim.