كتاب الحج
15  
The Book of Pilgrimage
(17)
Chapter: Clarifying the types of Ihram; and that it is permissible to perfom Hajj that is Ifrad, Tamattu and Qiran. It is permissible to join Hajj to Umrah. And when the pilgrim who is performing Qiran should exit Ihram
(17)
باب بَيَانِ وُجُوهِ الإِحْرَامِ وَأَنَّهُ يَجُوزُ إِفْرَادُ الْحَجِّ وَالتَّمَتُّعِ وَالْقِرَانِ وَجَوَازِ إِدْخَالِ الْحَجِّ عَلَى الْعُمْرَةِ وَمَتَى يَحِلُّ الْقَارِنُ مِنْ نُسُكِهِ
Sahih Muslim 1211 h

A'isha (Allah be pleased with her) said:

We proceeded with the Messenger of Allah (ﷺ) during the year of the Farewell Pilgrimage. There were those amongst us who had put on Ihram for Umra, and those who had put on Ihram both for Hajj and" Umra, and those amongst us who had put on Ihram for Hajj (only), while the Messenger of Allah (ﷺ) had put on Ihram for Hajj (only). He who put on Ihram for Umra put it off (after performing Umra), and he who had put on Ihram for Hajj or for both Hajj and 'Umra did not put it off before the day of sacrifice (10th of Dhu'l-Hijja).
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قَرَأْتُ عَلَى مَالِكٍ عَنْ أَبِي الأَسْوَدِ، مُحَمَّدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ نَوْفَلٍ عَنْ عُرْوَةَ، عَنْ عَائِشَةَ، - رضى الله عنها - أَنَّهَا قَالَتْ خَرَجْنَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم عَامَ حَجَّةِ الْوَدَاعِ فَمِنَّا مَنْ أَهَلَّ بِعُمْرَةٍ وَمِنَّا مَنْ أَهَلَّ بِحَجٍّ وَعُمْرَةٍ وَمِنَّا مَنْ أَهَلَّ بِالْحَجِّ وَأَهَلَّ رَسُولُ اللَّهِ صلى الله عليه وسلم بِالْحَجِّ فَأَمَّا مَنْ أَهَلَّ بِعُمْرَةٍ فَحَلَّ وَأَمَّا مَنْ أَهَلَّ بِحَجٍّ أَوْ جَمَعَ الْحَجَّ وَالْعُمْرَةَ فَلَمْ يَحِلُّوا حَتَّى كَانَ يَوْمُ النَّحْرِ ‏.‏
Reference : Sahih Muslim 1211h
In-book reference : Book 15, Hadith 126
USC-MSA web (English) reference : Book 7, Hadith 2771
  (deprecated numbering scheme)