Musannaf Ibn Abi Shayba 19:184

Abu Bakr narrated to us, he said: Isma'il ibn Ibrahim narrated to us, from Ayyub, who said: I wrote to Abu Qilabah asking him about a woman who is accused of unchastity (qadhf) while she had been owned (as a slave). He wrote back to me that the one who accuses her is to be flogged eighty lashes.