حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، عَنْ أَبِيهِ، أَنَّ عَائِشَةَ، زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَتْ تَلِي بَنَاتِ أَخِيهَا يَتَامَى فِي حَجْرِهَا لَهُنَّ الْحَلْىُ فَلاَ تُخْرِجُ مِنْ حُلِيِّهِنَّ الزَّكَاةَ ‏.‏

Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasimfrom his father that A'isha, the wife of the Prophet, may Allah blesshim and grant him peace, used to look after the orphaned daughters ofher brother in her house. They had jewellery (which they wore) and shedid not take zakat from this jewellery of theirs. Translation Not Available

Book Ref: Muwatta Imam Malik Book 17 Hadith 590
Web Ref:  Muwatta Imam Malik Book 17 Hadith 10