Sahih Muslim 1229 c
Hafsa (Allah be pleased with her) reported:
I said to Allah's Messenger (ﷺ): What is the matter with people that they have put off Ihram, whereas you have not put it off after your Umra'? He said: I have driven my sacrificial animal and stuck my hair, and it is not permissible for me to put off Ihram unless I have completed the Hajj.
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، عَنْ حَفْصَةَ، - رضى الله عنهم - قَالَتْ قُلْتُ لِلنَّبِيِّ صلى الله عليه وسلم مَا شَأْنُ النَّاسِ حَلُّوا وَلَمْ تَحِلَّ مِنْ عُمْرَتِكَ قَالَ ‏
"‏ إِنِّي قَلَّدْتُ هَدْيِي وَلَبَّدْتُ رَأْسِي فَلاَ أَحِلُّ حَتَّى أَحِلَّ مِنَ الْحَجِّ ‏"‏ ‏.‏