Anas b. Malik reported that Allah's Messenger (ﷺ) used to come to our house and there was perspiration upon his body. My mother brought a bottle and began to pour the sweat in that. When Allah's Messenger (ﷺ) got up he said: Umm Sulaim, what is this that you are doing? Thereupon she said: That is your sweat which we mix in our perfume and it becomes the most fragrant perfume.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا هَاشِمٌ، - يَعْنِي ابْنَ الْقَاسِمِ - عَنْ سُلَيْمَانَ، عَنْ ثَابِتٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ دَخَلَ عَلَيْنَا النَّبِيُّ صلى الله عليه وسلم فَقَالَ عِنْدَنَا فَعَرِقَ وَجَاءَتْ أُمِّي بِقَارُورَةٍ فَجَعَلَتْ تَسْلُتُ الْعَرَقَ فِيهَا فَاسْتَيْقَظَ النَّبِيُّ صلى الله عليه وسلم فَقَالَ " يَا أُمَّ سُلَيْمٍ مَا هَذَا الَّذِي تَصْنَعِينَ " . قَالَتْ هَذَا عَرَقُكَ نَجْعَلُهُ فِي طِيبِنَا وَهُوَ مِنْ أَطْيَبِ الطِّيبِ .
sunnah.com