"لا يخلون أحدكم بامرأة إلا مع ذي محرم"
Ibn Abbas (May Allah be pleased with them) said: The Messenger of Allah (ﷺ) said, "No one of you should meet a woman in privacy unless she is accompanied by a Mahram (i.e., a relative within the prohibited degrees)." [Al-Bukhari and Muslim] .