This is a munkar hadith; we do not know it from the hadiths of ʿUbaydullah ibn ʿUmar except through this chain, and al-Nadr is unknown, and Sayf is unknown. (1)

‌‌134 - Chapter: What has been reported concerning the virtue of Fatimah, may Allah be pleased with her

4205 - Qutaybah narrated to us, saying: al-Layth narrated to us, from Ibn Abi Mulaykah, from al-Miswar ibn Makhramah, who said: I heard the Prophet, peace and blessings be upon him, say while he was on the minbar: "The Banu Hisham ibn al-Mughirah have asked my permission to marry their daughter to ʿAli ibn Abi Talib, and I do not permit it, then I do not permit it, unless Ibn Abi Talib wishes to divorce my daughter and marry their daughter. For she is a piece of me; what troubles her troubles me, and what harms her harms me." (2)

This hadith is hasan and sahih.

4206 - Ibrahim ibn Saʿid al-Jawhari narrated to us, saying: al-Aswad ibn ʿAmir narrated to us, from Jaʿfar al-Ahmar, from ʿAbdullah ibn ʿAta', from Ibn Buraydah, from his father, who said: The most beloved of women to the Messenger of Allah, peace and blessings be upon him, was Fatimah.

--------------------------------------------
= Also narrated by al-Tabarani in "al-Awsat" (8362), al-Khatib in his "Tarikh" 3/195, and al-Mizzi in "Tahdhib al-Kamal" 12/327.
(1) From his saying: "and al-Nadr" to here is an addition from (S), and it is not found in the other manuscript sources.
(2) Its chain is sahih, and it was narrated in full and in abridged form by al-Bukhari (5230), Muslim (2449), Abu Dawud (2070) and (2071), Ibn Majah (1998), al-Nasa'i in "al-Kubra" (8370) and (8371), and it is in "al-Musnad" (18926), and "Sahih Ibn Hibban" (6955).