Sahih al-Bukhari, Volume 2, Book 26, Hadith 754 (USC-MSA) ⓘ
Narrated Hafsa: I said, "O Allah's Messenger! 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 " .
also referenced under: Book 25, Hadith 175 (In-Book) & Hadith 1697 (DarusSalam)