Sahih al-Bukhari 5109
Sahih al-Bukhari · Book 67: Wedlock, Marriage (Nikaah) · A woman should not marry a man already married to her paternal aunt
Narrated Abu Huraira:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ ، أَخْبَرَنَا مَالِكٌ ، عَنْ أَبِي الزِّنَادِ ، عَنِ الأَعْرَجِ ، عَنْ أَبِي هُرَيْرَةَ ، رضى الله عنه أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " لاَ يُجْمَعُ بَيْنَ الْمَرْأَةِ وَعَمَّتِهَا، وَلاَ بَيْنَ الْمَرْأَةِ وَخَالَتِهَا " .
Allah's Messenger (ﷺ) said, "A woman and her paternal aunt should not be married to the same man; and similarly, a woman and her maternal aunt should not be married to the same man."