Urwah narrates from Sayyidah Aishah (may Allah be pleased with her) that the dowers of the wives and daughters of the Messenger of Allah (peace and blessings be upon him) were only twelve uqiyah, except Sayyidah Umm Habibah (may Allah be pleased with her), because al-Najashi conducted her marriage and also paid four thousand as dower on his behalf; and the Prophet (peace and blessings be upon him) consummated the marriage but did not give her anything.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14346