Musnad Abu Ya'la al-Mawsili 129:52

Narrated to us Wahb, informed us Khalid, from Humayd, from Anas: That the Prophet (peace and blessings of Allah be upon him) used to visit Umm Sulaym and sleep on her bed. He was a heavy sleeper and sweated profusely. She would take his sweat with a piece of cotton and put it into a bottle, then she would put it into a perfume (sukk) she had.