Ata' (may Allah have mercy on him) narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): "There is no zihar from a slave woman."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الظهار / 15249
Ibn Abi Mulaykah narrates from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both): Whoever wishes, I will engage in mutual imprecation (mubahalah) with him that there is no zihar from a slave woman.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الظهار / 15250