Umm Sulaim, what is this? She said: It is your sweat, which I put in my perfume. Allah's Apostle ﷺ sweated in cold weather when revelation descended upon him. (Using translation from Muslim 2332)   

أَنَّ النَّبِيَّ ﷺ كَانَ يَأْتِيهَا فَيَقِيلُ عِنْدَهَا فَتَبْسُطُلَهُ نِطَعًا فَيَقِيلُ عِنْدَهَا وَكَانَ كَثِيرَ الْعَرَقِ فَتَجْمَعُ عَرَقَهُ فَتَجْعَلُهُ فِي الطِّيبِ وَالْقَوَارِيرِ قَالَتْ وَكَانَ يُصَلِّي عَلَى الْخُمْرَةِ  

[Machine] It was narrated that the Prophet ﷺ would visit Umm Salamah and it would be said to her, "He is upon a mattress." And he used to sweat a lot, so she would trace his sweat from the mattress and collect it in bottles along with fragrance. And he used to pray upon a triple mat.  

«أَنَّ النَّبِيَّ ﷺ كَانَ يَأْتِي أُمَّ سُلَيْمٍ فَيَقِيلُ عِنْدَهَا عَلَى نَطْعٍ وَكَانَ كَثِيرَ الْعَرَقِ فَتَتَبَّعُ الْعَرَقَ مِنَ النَّطْعِ فَتَجْعَلُهُ فِي قَوَارِيرَ مَعَ الطِّيبِ وَكَانَ يُصَلِّي عَلَى الْخُمْرَةِ»  

[Machine] It was reported that the Prophet ﷺ used to visit her and she would offer him a mat to sit on. It is narrated that the Prophet ﷺ had excessive perspiration, so she would collect his sweat and put it in a bottle. The Prophet ﷺ asked her, "What is this?" She replied, "We mix your sweat with perfumes." The Prophet ﷺ then prayed for blessings upon her.  

أَنَّ النَّبِيَّ ﷺ كَانَ يَأْتِيهَا فَيَقِيلُ عِنْدَهَا فَتَبْسُطُ لَهُ نِطَعًا فَيَقِيلُ عَلَيْهِ وَكَانَ كَثِيرَ الْعَرَقِ فَكَانَتْ تَجْمَعُ عَرَقَهُ فَتَجْعَلُهُ فِي الطِّيبِ وَالْقَوَارِيرِ فَقَالَ رَسُولُ اللهِ ﷺ مَا هَذَا؟ قَالَتْ عَرَقُكَ نَجْعَلُهُ فِي الطِّيبِ وَكَانَ النَّبِيُّ ﷺ يُصَلِّي عَلَى الْخُمْرَة