Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(107)
Chapter: To twist (and make) the garlands for the Budn
(107)
باب فَتْلِ الْقَلاَئِدِ لِلْبُدْنِ وَالْبَقَرِ
Sahih al-Bukhari 1697

Narrated Hafsa:

I said, "O Allah's Messenger (ﷺ)! What is wrong with the people, they have finished their Ihram but you have not?" He said, "I matted my hair and I have garlanded my Hadi, so I will not finish my Ihram till I finished my Hajj ."

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، قَالَ أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، عَنْ حَفْصَةَ، رضى الله عنهم قَالَتْ قُلْتُ يَا رَسُولَ اللَّهِ مَا شَأْنُ النَّاسِ حَلُّوا وَلَمْ تَحْلِلْ أَنْتَ قَالَ ‏ "‏ إِنِّي لَبَّدْتُ رَأْسِي، وَقَلَّدْتُ هَدْيِي، فَلاَ أَحِلُّ حَتَّى أَحِلَّ مِنَ الْحَجِّ ‏"‏‏.‏
Reference : Sahih al-Bukhari 1697
In-book reference : Book 25, Hadith 175
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 754
  (deprecated numbering scheme)