Narrated Ali ibn AbuTalib: When we came out from Mecca, Hamzah's daughter pursued us crying: My uncle. Ali lifted her and took her by the hand. (Addressing Fatimah he said:) Take your uncle's daughter. She then lifted her. The narrator then transmitted the rest of the tradition. Ja'far said: She is my uncle's daughter. Her maternal aunt is my wife. The Prophet (ﷺ) decided in favour of her maternal aunt, and said: The maternal aunt is like mother.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبَّادُ بْنُ مُوسَى، أَنَّ إِسْمَاعِيلَ بْنَ جَعْفَرٍ، حَدَّثَهُمْ عَنْ إِسْرَائِيلَ، عَنْ أَبِي إِسْحَاقَ، عَنْ هَانِئٍ، وَهُبَيْرَةَ، عَنْ عَلِيٍّ، قَالَ لَمَّا خَرَجْنَا مِنْ مَكَّةَ تَبِعَتْنَا بِنْتُ حَمْزَةَ تُنَادِي يَا عَمِّ يَا عَمِّ . فَتَنَاوَلَهَا عَلِيٌّ فَأَخَذَ بِيَدِهَا وَقَالَ دُونَكِ بِنْتَ عَمِّكِ . فَحَمَلَتْهَا فَقَصَّ الْخَبَرَ قَالَ وَقَالَ جَعْفَرٌ ابْنَةُ عَمِّي وَخَالَتُهَا تَحْتِي . فَقَضَى بِهَا النَّبِيُّ صلى الله عليه وسلم لِخَالَتِهَا وَقَالَ " الْخَالَةُ بِمَنْزِلَةِ الأُمِّ " .
sunnah.com