Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahmanthat Muhammad ibn Ali ibn al-Husayn said, "Fatima, the daughter of theMessenger of Allah, may Allah bless him and grant him peace, weighedthe hair of Hasan and Husayn, and gave away in sadaqa the equivalentweight in silver."
USC-MSA web (English) reference: Book 26, Hadith 3
Arabic reference: Book 26, Hadith 1072