Sahih Muslim 1866 b
It has been narrated on the authority of 'Urwa that 'A'isha described to him the way the Prophet (ﷺ) took the oath of fealty from women. She said:
The Messenger of Allah (ﷺ) never touched a woman with his hand. He would only take a vow from her and when he had taken the (verbal) vow, he would say: You may go. I have accepted your fealty.
وَحَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ، وَأَبُو الطَّاهِرِ، قَالَ أَبُو الطَّاهِرِ أَخْبَرَنَا وَقَالَ، هَارُونُ حَدَّثَنَا ابْنُ وَهْبٍ، حَدَّثَنِي مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عُرْوَةَ، أَنَّ عَائِشَةَ، أَخْبَرَتْهُ عَنْ بَيْعَةِ النِّسَاءِ، قَالَتْ مَا مَسَّ رَسُولُ اللَّهِ صلى الله عليه وسلم بِيَدِهِ امْرَأَةً قَطُّ إِلاَّ أَنْ يَأْخُذَ عَلَيْهَا فَإِذَا أَخَذَ عَلَيْهَا فَأَعْطَتْهُ قَالَ ‏
"‏ اذْهَبِي فَقَدْ بَايَعْتُكِ ‏"‏ ‏.‏