AbuUsayd heard the Messenger of Allah ﷺ say when he was coming out of the mosque, and men and women were mingled in the road: Draw back, for you must not walk in the middle of the road; keep to the sides of the road. Then women were keeping so close to the wall that their garments were rubbing against it.  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ وَهُوَ خَارِجٌ مِنَ الْمَسْجِدِ فَاخْتَلَطَ الرِّجَالُ مَعَ النِّسَاءِ فِي الطَّرِيقِ فَقَالَ رَسُولُ اللَّهِ ﷺ لِلنِّسَاءِ اسْتَأْخِرْنَ فَإِنَّهُ لَيْسَ لَكُنَّ أَنْ تَحْقُقْنَ الطَّرِيقَ عَلَيْكُنَّ بِحَافَاتِ الطَّرِيقِ فَكَانَتِ الْمَرْأَةُ تَلْتَصِقُ بِالْجِدَارِ حَتَّى إِنَّ ثَوْبَهَا لَيَتَعَلَّقُ بِالْجِدَارِ مِنْ لُصُوقِهَا بِهِ  

The Prophet ﷺ prohibited that one, i.e. man, should walk between two women.  

أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يَمْشِيَ يَعْنِي الرَّجُلَ بَيْنَ الْمَرْأَتَيْنِ