مُوَطَّأُ مَالِكٍ
Muwatta Malik 1071
The 'Aqiqa
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ جَعْفَرِ بْنِ مُحَمَّدٍ، عَنْ أَبِيهِ، أَنَّهُ قَالَ وَزَنَتْ فَاطِمَةُ بِنْتُ رَسُولِ اللَّهِ صلى الله عليه وسلم شَعَرَ حَسَنٍ وَحُسَيْنٍ وَزَيْنَبَ وَأُمِّ كُلْثُومٍ فَتَصَدَّقَتْ بِزِنَةِ ذَلِكَ فِضَّةً .
Yahya related to me from Malik from Jafar ibn Muhammad that his father said, "Fatima, the daughter of the Messenger of Allah, (ﷺ), weighed the hair of Hasan, Husayn, Zaynab and Umm Kulthum, and gave away in sadaqa an equivalent weight of silver."
Arabic/English book reference: Book 26, Hadith 2