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." (PT)
English reference (PT): Vol. 4, Book 32, Hadith 3623 (PT)
Arabic reference (PT): Book 32, Hadith 3754 (PT)