Sayyiduna Miswar bin Makhramah (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) saying while he was on the pulpit: "The Banu Hisham bin al-Mughirah have asked my permission to marry their daughter to Ali bin Abi Talib (may Allah be pleased with him). I will not give them permission. My daughter is a part of me; whoever troubles her troubles me, and whoever hurts her hurts me."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب العتق / 21413