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.
USC-MSA web (English) reference: Book 30, Hadith 9
Arabic reference: Book 30, Hadith 1283