Musannaf Ibn Abi Shayba 27:461

Waki’ narrated to us, from Hisham bin Sa’d, from ‘Umar bin Usayd, from Ibn ‘Umar, who said: ‘Umar bin al-Khattab—or he said: my father—said: “‘Ali bin Abi Talib was given three characteristics; that I should have one of them is more beloved to me than red camels: [The Prophet] married his daughter to him, and she bore him children; he closed the doors [of the mosque] except for his door; and he gave him the banner on the day of Khaybar.”