Musannaf Ibn Abi Shayba 19:187

Abu Bakr narrated to us, he said: Abu Dawud al-Tayalisi narrated to us, from Hisham, from Qatada, from al-Hasan, regarding a woman who was owned (as a slave) once, then she was accused of unchastity (qadhf). He said: The one who accused her is not to be flogged.