بُلُوغُ الْمَرَامِ
Bulugh al-Maram 1130
Marriage
وَعَنْهَا: { أَنْ أَفْلَحَ -أَخَا أَبِي الْقُعَيْسِ- جَاءَ يَسْتَأْذِنُ عَلَيْهَا بَعْدَ اَلْحِجَابِ. قَالَتْ: فَأَبَيْتُ أَنْ آذَنَ لَهُ, فَلَمَّا جَاءَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -أَخْبَرْتُهُ بِاَلَّذِي صَنَعْتُ, فَأَمَرَنِي أَنْ آذَنَ لَهُ عَلَيَّ. وَقَالَ: إِنَّهُ عَمُّكِ . } مُتَّفَقٌ عَلَيْهِ . [1] .
Narrated ['Aishah (RA)]: Aflah (her foster suckling uncle), brother of Abul-Qais, came and asked her permission to enter after the Hijab (was instituted for women). She said, "I refused to allow him in and when Allah's Messenger (ﷺ) came, I told him about what I had done, so he commanded me to give him permission to enter where I am and said, 'He is your paternal uncle.'" [Agreed upon].
Sunnah.com reference: Book 8, Hadith 194