‘Amr ibn al-‘As reported: The Messenger of Allah, peace and blessings be upon him, climbed the pulpit and he said, “After this day, certainly no man may enter the home of a woman whose husband is absent unless he has with him another man or two.”
Source: Ṣaḥīḥ Muslim 2173
Grade: Sahih (authentic) according to Muslim
عَنْ عَمْرِو بْنِ الْعَاصِ قَالَ قَامَ رَسُولُ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ عَلَى الْمِنْبَرِ فَقَالَ لَا يَدْخُلَنَّ رَجُلٌ بَعْدَ يَوْمِي هَذَا عَلَى مُغِيبَةٍ إِلَّا وَمَعَهُ رَجُلٌ أَوِ اثْنَانِ
2173 صحيح مسلم كتاب السلام باب تحريم الخلوة بالأجنبية والدخول عليها