Sahih Muslim, hadith 2988

وَحَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا هِشَامُ بْنُ سُلَيْمَانَ الْمَخْزُومِيُّ، وَعَبْدُ الْمَجِيدِ، عَنِ ابْنِ جُرَيْجٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ حَدَّثَتْنِي حَفْصَةُ، - رضى الله عنها - أَنَّ النَّبِيَّ صلى الله عليه وسلم أَمَرَ أَزْوَاجَهُ أَنْ يَحْلِلْنَ عَامَ حَجَّةِ الْوَدَاعِ ‏.‏ قَالَتْ حَفْصَةُ فَقُلْتُ مَا يَمْنَعُكَ أَنْ تَحِلَّ قَالَ ‏ "‏ إِنِّي لَبَّدْتُ رَأْسِي وَقَلَّدْتُ هَدْيِي فَلاَ أَحِلُّ حَتَّى أَنْحَرَ هَدْيِي ‏"‏ ‏.‏

Hafsa (Allah be pleased with her) said that Allah's Apostle (ﷺ) commanded his wives that they should put off Ihram during the year of Hajj (at-ul-Wada'). whereupon she (Hafsa) said:What hinders you that you have not put off Ihram? Thereupon he said: I have stuck my hair and driven my sacrificial animal along with men and it is not permissible to put off Ihram (under this condition until I have sacrificed the animal)