Jabir bin Abdullah (may Allah be pleased with them both) says that Abu Quhafah was brought on the day of the Conquest of Makkah, and his head and beard were (white) like the flowers of the thaghamah plant. The Messenger of Allah (peace and blessings be upon him) said: "Change this with something, and avoid black."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14822