Anas bin Malik (may Allah be pleased with him) said that when he (peace and blessings be upon him) had his hair shaved on the Day of Sacrifice, the people separated and began taking his (peace and blessings be upon him) hair. Abu Talhah (may Allah be pleased with him) also obtained some of it.
Ibn Sirin (may Allah have mercy on him) said: "That I should have a single hair of his is dearer to me than the world and all that is in it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النكاح / 13410