Hadith: The Prophet (may Allah's peace and blessings be upon him) once came to our house and had a ‎siesta. While sleeping, there was perspiration upon his body. My mother brought a bottle and ‎kept collecting the sweat in it.

عن أنس بن مالك رضي الله عنه ، قال: دخَل علينا النبي صلى الله عليه وسلم فَقَالَ عِنْدَنا، فعَرِقَ، وجاءت أمِّي بقَارُورَة، فَجَعَلَتْ تَسْلُتُ العَرَق فيها، فاستَيْقَظ النبي صلى الله عليه وسلم فقال: «يا أمَّ سُليم ما هذا الذي تَصْنَعِين؟» قالت: هذا عَرَقُك نَجْعَله في طِيبِنا، وهو مِنْ أَطْيَب الطِّيبِ.
[صحيح] - [رواه مسلم]

Anas ibn Mālik (may Allah be pleased with him) reported: The Prophet (may Allah's peace and blessings be upon him) once came to our house and had a siesta. While sleeping, there was perspiration upon his body. My mother brought a bottle and kept collecting the sweat in it. This awakened the Prophet (may Allah's peace and blessings be upon him) who asked her: "What are you doing, O Umm Sulaym?" She answered: "This is your sweat, we mix it with our perfume, as it is from the best perfumes."
[Authentic hadith] - [Narrated by Muslim]

Explanation

Anas ibn Mālik (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) once entered their house in the afternoon and had a siesta there. While sleeping, the mother of Anas (may Allah be pleased with her) brought a glass bottle and collected the sweat of the Prophet (may Allah's peace and blessings be upon him) in it. The Prophet (may Allah's peace and blessings be upon him) got up and asked her about the purpose of collecting his sweat. Thereupon, she answered that she mixes his sweat with her perfume, as it is among the best perfumes.