Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(18)
Chapter: The use of perfume while assuming Ihram
(18)
باب الطِّيبِ عِنْدَ الإِحْرَامِ
Sahih al-Bukhari 1537, 1538

Narrated Sa`id bin Jubair:

Ibn `Umar used to oil his hair. I told that to Ibrahim who said, "What do you think about this statement: Narrated Aswad from `Aisha: As if I were now observing the glitter of the scent in the parting of the hair of the Prophet (ﷺ) while he was Muhrim?"

حَدَّثَنَا مُحَمَّدُ بْنُ يُوسُفَ، حَدَّثَنَا سُفْيَانُ، عَنْ مَنْصُورٍ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، قَالَ كَانَ ابْنُ عُمَرَ ـ رضى الله عنهما ـ يَدَّهِنُ بِالزَّيْتِ‏.‏ فَذَكَرْتُهُ لإِبْرَاهِيمَ قَالَ مَا تَصْنَعُ بِقَوْلِهِ حَدَّثَنِي الأَسْوَدُ عَنْ عَائِشَةَ ـ رضى الله عنها ـ قَالَتْ كَأَنِّي أَنْظُرُ إِلَى وَبِيصِ الطِّيبِ فِي مَفَارِقِ رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ مُحْرِمٌ‏.‏
Reference : Sahih al-Bukhari 1537, 1538
In-book reference : Book 25, Hadith 25
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 611
  (deprecated numbering scheme)