Muwatta Imam Malik Book of Hajj, Hadith 189

Yahya related to me from Malik from Nafi from Abdullah ibn Umar that Hafsa, umm al-muminin, once said to the Messenger of Allah ﷺ "Why is it that everyone has left ihram and you still have not left ihram from your umra?" and he replied, "I have matted my hair and garlanded my sacrificial animal and will not leave ihram until I have sacrificed the animal."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ حَفْصَةَ أُمِّ الْمُؤْمِنِينَ، أَنَّهَا قَالَتْ لِرَسُولِ اللَّهِ ﷺ مَا شَأْنُ النَّاسِ حَلُّوا وَلَمْ تَحْلِلْ أَنْتَ مِنْ عُمْرَتِكَ فَقَالَ " إِنِّي لَبَّدْتُ رَأْسِي وَقَلَّدْتُ هَدْيِي فَلاَ أَحِلُّ حَتَّى أَنْحَرَ " .