Musnad Abu Ya'la al-Mawsili 225:4

Zuhayr narrated to us, Ubayd Allah ibn Abd al-Majid al-Hanafi narrated to us, Abdullah ibn Umar narrated to us, from Ibrahim ibn Muhammad, from his father, from Zaynab bint Jahsh, that she used to comb the hair of the Prophet, may Allah bless him and grant him peace, in a basin made of brass.