From Sahih Muslim (Hadith 6057):
Umm Sulaim reported that Allah's Apostle (ﷺ) visited her house and (took rest) and she spread a piece of cloth for him and he had had a siesta on it. And he sweated profusely and she collected his sweat and put it in a perfume and in bottles. Allah's Apostle (ﷺ) said: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
Reference: Muslim 6057