وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ رَبِيعَةَ بْنِ أَبِي عَبْدِ الرَّحْمَنِ، عَنْ مُحَمَّدِ بْنِ عَلِيِّ بْنِ الْحُسَيْنِ، أَنَّهُ قَالَ وَزَنَتْ فَاطِمَةُ بِنْتُ رَسُولِ اللَّهِ صلى الله عليه وسلم شَعَرَ حَسَنٍ وَحُسَيْنٍ فَتَصَدَّقَتْ بِزِنَتِهِ فِضَّةً ‏.‏

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." Translation Not Available

Book Ref: Muwatta Imam Malik Book 26 Hadith 1072
Web Ref:  Muwatta Imam Malik Book 26 Hadith 3