It was narrated from Hafsah, the wif3e of the Prophet, that she said:

"O Messenger of Allah, why is it that the people have exited Ihram for Umrah but you have not exited your Ihram for Umrah? He said: "I have matted my hair and garlanded my Hadi, so I will not exit Ihram until I have offered the sacrifice."

أَخْبَرَنَا مُحَمَّدُ بْنُ سَلَمَةَ، قَالَ أَنْبَأَنَا ابْنُ الْقَاسِمِ، حَدَّثَنِي مَالِكٌ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، عَنْ حَفْصَةَ، زَوْجِ النَّبِيِّ ﷺ أَنَّهَا قَالَتْ يَا رَسُولَ اللَّهِ مَا شَأْنُ النَّاسِ قَدْ حَلُّوا بِعُمْرَةٍ وَلَمْ تَحْلِلْ أَنْتَ مِنْ عُمْرَتِكَ قَالَ " إِنِّي لَبَّدْتُ رَأْسِي وَقَلَّدْتُ هَدْيِي فَلاَ أَحِلُّ حَتَّى أَنْحَرَ " .