Musannaf Ibn Abi Shayba 13:2377

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Hammad ibn Salamah narrated to us, from Qatadah, from ‘Ubayd Abu Qudamah, who said: Umar ibn al-Khattab ruled regarding the dowries of women: Whatever is present in its essence, she is more entitled to it.