Musannaf Ibn Abi Shayba 19:355

Abu Bakr narrated to us, he said: Shababa bin Sawwar narrated to us, from Shu'ba, who said: I asked al-Hakam and Hammad about a slave who forcibly took a slave-girl. They both said: "The prescribed punishment (hadd) is upon him, and the dowry (sadaq) is not upon him."