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'Uthman bin 'Urwah narrated that his father said: "I said to 'Aishah: 'What kind of perfume did you put on the Messenger of Allah?' she said: 'The best kind of perfume, when he entered Ihram and when he exited Ihram.
Source: sunnah.com
Other translations
Arabic
أَخْبَرَنَا مُحَمَّدُ بْنُ مَنْصُورٍ، قَالَ حَدَّثَنَا سُفْيَانُ، قَالَ حَدَّثَنَا عُثْمَانُ بْنُ عُرْوَةَ، عَنْ أَبِيهِ، قَالَ قُلْتُ لِعَائِشَةَ بِأَىِّ شَىْءٍ طَيَّبْتِ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَتْ بِأَطْيَبِ الطِّيبِ عِنْدَ حُرْمِهِ وَحِلِّهِ .
sunnah.com