Musannaf Ibn Abi Shayba 1:1536

Waki’ narrated to us, from Isma’il bin Abi Khalid, from his father, who said: I had a debt owed to me by al-Husayn [al-Hasan] bin ‘Ali, so I came to him to demand payment. I found that he had come out of the bathhouse, and the henna had left a mark on his fingernails, and a slave girl was scraping the henna off him with a glass vial.