Hadith on Mahram: Men and women should not mix in private

Jabir ibn Abdullah reported: The Messenger of Allah, peace and blessings be upon him, said, “Whoever has faith in Allah and the Last Day, let him not be secluded with an unrelated woman without her guardian lest Satan be the third of them.”

Source: Musnad Aḥmad 14651

Grade: Sahih (authentic) according to Al-Albani

عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ كَانَ يُؤْمِنُ بِاللَّهِ وَالْيَوْمِ الْآخِرِ فَلَا يَخْلُوَنَّ بِامْرَأَةٍ لَيْسَ مَعَهَا ذُو مَحْرَمٍ مِنْهَا فَإِنَّ ثَالِثَهُمَا الشَّيْطَانُ

14651 مسند أحمد بن حنبل

180 المحدث الألباني خلاصة حكم المحدث صحيح في غاية المرام