Sahih Bukhari Volume 2, Book 25, Hadith 1619

وَقَالَ لِي عَمْرُو بْنُ عَلِيٍّ حَدَّثَنَا أَبُو عَاصِمٍ، قَالَ ابْنُ جُرَيْجٍ أَخْبَرَنَا قَالَ أَخْبَرَنِي عَطَاءٌ، إِذْ مَنَعَ ابْنُ هِشَامٍ النِّسَاءَ الطَّوَافَ مَعَ الرِّجَالِ قَالَ كَيْفَ يَمْنَعُهُنَّ، وَقَدْ طَافَ نِسَاءُ النَّبِيِّ صلى الله عليه وسلم مَعَ الرِّجَالِ قُلْتُ أَبَعْدَ الْحِجَابِ أَوْ قَبْلُ قَالَ إِي لَعَمْرِي لَقَدْ أَدْرَكْتُهُ بَعْدَ الْحِجَابِ‏.‏ قُلْتُ كَيْفَ يُخَالِطْنَ الرِّجَالَ قَالَ لَمْ يَكُنَّ يُخَالِطْنَ كَانَتْ عَائِشَةُ ـ رضى الله عنها ـ تَطُوفُ حَجْرَةً مِنَ الرِّجَالِ لاَ تُخَالِطُهُمْ، فَقَالَتِ امْرَأَةٌ انْطَلِقِي نَسْتَلِمْ يَا أُمَّ الْمُؤْمِنِينَ‏.‏ قَالَتْ ‏{‏انْطَلِقِي‏}‏ عَنْكِ‏.‏ وَأَبَتْ‏.‏ ‏{‏وَكُنَّ‏}‏ يَخْرُجْنَ مُتَنَكِّرَاتٍ بِاللَّيْلِ، فَيَطُفْنَ مَعَ الرِّجَالِ، وَلَكِنَّهُنَّ كُنَّ إِذَا دَخَلْنَ الْبَيْتَ قُمْنَ حَتَّى يَدْخُلْنَ وَأُخْرِجَ الرِّجَالُ، وَكُنْتُ آتِي عَائِشَةَ أَنَا وَعُبَيْدُ بْنُ عُمَيْرٍ وَهِيَ مُجَاوِرَةٌ فِي جَوْفِ ثَبِيرٍ‏.‏ قُلْتُ وَمَا حِجَابُهَا قَالَ هِيَ فِي قُبَّةٍ تُرْكِيَّةٍ لَهَا غِشَاءٌ، وَمَا بَيْنَنَا وَبَيْنَهَا غَيْرُ ذَلِكَ، وَرَأَيْتُ عَلَيْهَا دِرْعًا مُوَرَّدًا‏

Ibn Juraij said:"Ata informed us that when Ibn Hisham forbade women to perform Tawaf with men he said to him, How do you forbid them while the wives of the prophet(s.a.w.) used to perform Tawaf with the men?' I said ,'Was this before decreeing the use of the evil or after it?'Ata took an oath and said ,"I saw it after the order of evil.'I said, 'How did they mix with the men?' Ata said, 'The women never mixed with the men and Aisha(R.A.) used to perform Tawaf seperately and never mixed with the men.(Once it happened that Aisha was performing the Twaf and a woman said to her,'O Mother of believers! Let us touch the black stone.'Aisha said to her,'Go yourself' and she herself refused to do so. The wives of Prophet(s.a.w.) used to come out at night, in disguise and used to perform Tawaf with the men.But whenever they intended to enter the Ka'abah , they would stay outside till the men had gone out.I and Ubaid Bin Umair used to visit Aisha(r.A.) while she was residing at Jauf Thabir."I asked what was her veil? Ata said , " She was wearing an old turkish veil, and that was the only thing(veil) which was a screen between us and her. I saw a pink cover on her."