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