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 1214

Jabir b. Abdullah reported that the Messenger of Allah (ﷺ) ordered us to put on Ihram (again) as we proceeded towards Mina after we had put it off (i. e. 'on the 8th of Dhu'l-Hijja). So we pronounced Talbiya at al-Abtah.

وَحَدَّثَنِي مُحَمَّدُ بْنُ حَاتِمٍ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ، عَنِ ابْنِ جُرَيْجٍ، أَخْبَرَنِي أَبُو الزُّبَيْرِ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، - رضى الله عنهما - قَالَ أَمَرَنَا النَّبِيُّ صلى الله عليه وسلم لَمَّا أَحْلَلْنَا أَنْ نُحْرِمَ إِذَا تَوَجَّهْنَا إِلَى مِنًى ‏.‏ قَالَ فَأَهْلَلْنَا مِنَ الأَبْطَحِ ‏.‏
Reference : Sahih Muslim 1214
In-book reference : Book 15, Hadith 150
USC-MSA web (English) reference : Book 7, Hadith 2795
  (deprecated numbering scheme)