Miswar bin Makhramah (may Allah be pleased with them both) says: I heard the Messenger of Allah (peace and blessings be upon him) say: "Banu al-Mughirah have asked my permission to marry their daughter to Ali (may Allah be pleased with him). I will not give them permission, I will not give permission, I will not give permission; but if Ali bin Abi Talib (may Allah be pleased with him) intends to marry their daughter, then let him divorce my daughter. For she is a part of my body; whoever troubles her troubles me, and whoever hurts her hurts me."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب القسم والنشوز / 14798