I heard Messenger of Allah ﷺ say: Father's sister should not be combined with her brother's daughter, nor the daughter of a sister with her mother's sister.
سَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ لاَ تُنْكَحُ الْعَمَّةُ عَلَى بِنْتِ الأَخِ وَلاَ ابْنَةُ الأُخْتِ عَلَى الْخَالَةِ
One should not combine in marriage a woman with her father's sister, or her mother's sister. (Using translation from Muslim 1408e)
قَالَ رَسُولُ اللهِ ﷺ لَا تُنْكَحُ الْمَرْأَةُ عَلَى عَمَّتِهَا وَلَا عَلَى خَالَتِهَا وَلَا الْمَرْأَةُ عَلَى ابْنَةِ أَخِيهَا وَلَا عَلَى ابْنَةِ أُخْتِهَا
[Machine] Did you hear about the Messenger of Allah ﷺ, he said, "I heard him say, 'The daughter of the brother and the daughter of the sister are not permissible through breastfeeding.'"
سَمِعْتَ عَنْ رَسُولِ اللهِ ﷺ فَقَالَ سَمِعْتُهُ يَقُولُ «لَا تَحِلُّ بِنْتُ الْأَخِ وَلَا بِنْتُ الْأُخْتِ مِنَ الرَّضَاعَةِ»
"لَا تُنْكَحُ العَمَّةُ عَلَى ابنَةِ الأَخ، وَلَا ابْنَةُ الأُخْتِ عَلَى الخَالَةِ".