كتاب الحج
15  
The Book of Pilgrimage
(7)
Chapter: It is recommended to apply perfume just before entering Ihram, and it is recommended to use Musk, and it does not matter if its glistening traces remain
(7)
باب الطِّيبِ لِلْمُحْرِمِ عِنْدَ الإِحْرَامِ ‏
Sahih Muslim 1189 d

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

I applied perfume to the Messenger of Allah (ﷺ) as he became free from Ihram and as he entered upon it.
وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي، حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ، قَالَ سَمِعْتُ الْقَاسِمَ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ طَيَّبْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم لِحِلِّهِ وَلِحِرْمِهِ‏.‏
Reference : Sahih Muslim 1189d
In-book reference : Book 15, Hadith 37
USC-MSA web (English) reference : Book 7, Hadith 2683
  (deprecated numbering scheme)