Hadith 692
Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) narrates: When the Prophet Muhammad (peace and blessings be upon him) came to Makkah, Abu Quhafah was brought to him, and his head and beard were like the herb "thaghamah" (white grass). So the Messenger of Allah (peace and blessings be upon him) said: "Change the color of old age and avoid black dye."