كتاب النكاح
8  
Marriage
Ahmad reported it from the Hadith of 'Ali (RA), he said, "The little girl must be with her maternal aunt for the maternal aunt is (the same as) a mother."
وَأَخْرَجَهُ أَحْمَدُ: مِنْ حَدِيثِ عَلَيٍّ فَقَالَ: { وَالْجَارِيَةُ عِنْدَ خَالَتِهَا, فَإِنَّ اَلْخَالَةَ وَالِدَةٌ } 1


‏1 ‏- صحيح.‏ رواه أحمد (770)‏.‏

Sunnah.com reference : Book 8, Hadith 220
English translation : Book 8, Hadith 1166
Arabic reference : Book 8, Hadith 1155