بُلُوغُ الْمَرَامِ
Bulugh al-Maram 1154
Marriage
وَعَنْ اَلْبَرَاءِ بْنِ عَازِبِ رَضِيَ اَللَّهُ عَنْهُمَا; { أَنَّ اَلنَّبِيَّ - صلى الله عليه وسلم -قَضَى فِي اِبْنَةِ حَمْزَةَ لِخَالَتِهَا, وَقَالَ: اَلْخَالَةُ بِمَنْزِلَةِ اَلْأُمِّ. } أَخْرَجَهُ اَلْبُخَارِيُّ [1] .
Narrated al-Bara bin 'Azib (RA): The Prophet (ﷺ) gave a ruling regarding Hamza's daughter in favor of her maternal aunt, saying, "The maternal aunt is in the position of the mother." [al-Bukhari reported it].
Sunnah.com reference: Book 8, Hadith 219