Uthman bin Abdullah bin Mawhab narrates: We went to Sayyidah Umm Salamah (may Allah be pleased with her), and she brought out a small bag for us in which there was hair of the Prophet (peace and blessings be upon him) dyed with henna, and she said: "This is some of the hair of the Prophet (peace and blessings be upon him)."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20067