Ash-Shiqaq (the breach between the man and his wife).

Narrated Al-Miswar bin Makhrama Az-Zuhri:

I heard the Prophet saying, "Banu Al-Mughira have asked my leave to let 'Ali marry their daughter, but I give no leave to this effect."

حَدَّثَنَا أَبُو الْوَلِيدِ، حَدَّثَنَا اللَّيْثُ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، عَنِ الْمِسْوَرِ بْنِ مَخْرَمَةَ، قَالَ سَمِعْتُ النَّبِيَّ ﷺ يَقُولُ " إِنَّ بَنِي الْمُغِيرَةِ اسْتَأْذَنُوا فِي أَنْ يَنْكِحَ عَلِيٌّ ابْنَتَهُمْ، فَلاَ آذَنُ ".