Musannaf Ibn Abi Shayba 18:445

Abu Bakr narrated to us, he said: Humayd ibn Abd al-Rahman narrated to us, from Hasan ibn Salih, from Ubaydah, from Yazid al-Dakhm, from Ali, he said: If the spine is broken and sexual intercourse is prevented, then in it is the blood money (diyah).