"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."  

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  

That when the Prophet of Allah came to Dhul-Hulaifah he marked the Hadi on the right side of its hump, the he removed the blood and garlanded it with two shoes, then he mounted his she-camel and when it stood up with him Al-Baida, he recited the Talbiyah and entered Ihram at noon and enter Ihram for Hajj.  

أَنَّ نَبِيَّ اللَّهِ ﷺ لَمَّا أَتَى ذَا الْحُلَيْفَةِ أَشْعَرَ الْهَدْىَ فِي جَانِبِ السَّنَامِ الأَيْمَنِ ثُمَّ أَمَاطَ عَنْهُ الدَّمَ وَقَلَّدَهُ نَعْلَيْنِ ثُمَّ رَكِبَ نَاقَتَهُ فَلَمَّا اسْتَوَتْ بِهِ الْبَيْدَاءَ لَبَّى وَأَحْرَمَ عِنْدَ الظُّهْرِ وَأَهَلَّ بِالْحَجِّ