It was narrated from Anas bin Malik that:The Prophet [SAW] lay down on a leather mat and sweated. Umm Sulaim got up and collected his sweat and put it in a bottle. The Prophet [SAW] saw her and said: "What are you doing O Umm Sulaim?" She said: "I am putting your sweat in my perfume." And the Prophet [SAW] smiled

English translation · Sunan an-Nasa'i