It wasnarrated that 'Uthman bin Mawhab said:
"I entered upon UmmSalamah and she brought out for me a hair of the Messenger of Allah(ﷺ), which was dyed with henna and Katam." (ID)
English reference (ID): Vol. 4, Book 32, Hadith 3623 (ID)
Arabic reference (ID): Book 32, Hadith 3754 (ID)