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.
Sahih Muslim Book 43, Hadith 113
← Previous Hadith Anas reported that Allah's Messenger (ﷺ) had a very fair complexion and (the drops) of his perspiration shone like pearls, and when he walked he walked inclining forward, and I never touched brocade and silk (and found it) as soft as the softness of the palm of Allah's Messenger (ﷺ) and I never smelt musk or ambergris and found its fragrance as sweet as the fragrance of Allah's Messenger (ﷺ).

Sahih Muslim Book 43, Hadith 112 Next Hadith → It is Allah's Apostle (ﷺ) who is having siesta in your house, lying in your bed. She came and found him sweating and his sweat falling on the leather cloth spread on her bed. She opened her scent-bag and began to fill the bottles with it. Allah's Apostle (ﷺ) was startled and woke up and said: Umm Sulaim, what are you doing? She said: Allah's Messenger, we seek blessings for our children through it. Thereupon he said: You have done something right.

Sahih Muslim Book 43, Hadith 114