وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ، عَنْ أَبِيهِ، أَنَّهُ أَخْبَرَهُ أَنَّ عَائِشَةَ زَوْجَ النَّبِيِّ صلى الله عليه وسلم كَانَ يَدْخُلُ عَلَيْهَا مَنْ أَرْضَعَتْهُ أَخَوَاتُهَا وَبَنَاتُ أَخِيهَا وَلاَ يَدْخُلُ عَلَيْهَا مَنْ أَرْضَعَهُ نِسَاءُ إِخْوَتِهَا ‏.‏

Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasimthat his father told him that A'isha, the wife of the Prophet, mayAllah bless him and grant him peace, admitted those whom her sistersand the daughters of her brother had nursed, and she did not admitthose who were nursed by the wives of her brothers. Translation Not Available

Book Ref: Muwatta Imam Malik Book 30 Hadith 1283
Web Ref:  Muwatta Imam Malik Book 30 Hadith 9