I heard the Messenger of Allah ﷺ say from the pulpit, "The sons of Hisham bin Mughira have asked my permission to marry their daughter to Ali bin Abu Talib. I will not give them permission, then I will not give them permission, then I will not give them permission, unless Ali bin Abu Talib wishes to divorce my daughter and marry theirs. She is but a part of me. What troubles her troubles me, and what harms her harms me."
حدثنا عيسى بن حماد المصري حدثنا الليث بن سعد عن عبد الله بن أبي مليكة
سمعت رسول الله ﷺ وهو على المنبر يقول إن بني هشام بن المغيرة استأذنوني أن ينكحوا ابنتهم علي بن أبي طالب فلا آذن لهم ثم لا آذن لهم ثم لا آذن لهم إلا أن يريد علي بن أبي طالب أن يطلق ابنتي وينكح ابنتهم فإنما هي بضعة مني يريبني ما رابها ويؤذيني ما آذاها
Bukhari related it in the Book of Marriage, Chapter on a Man Defending His Daughter Out of Jealousy and Fairness, hadith no. 5230, and Muslim related it in the Book of the Virtues of the Companions, Chapter on the Virtues of Fatimah, the Daughter of the Prophet , hadith no. 2449, from the hadith of Layth, with the same wording.