Musannaf Ibn Abi Shayba 13:1101

Abu Bakr narrated to us, he said: Sufyan ibn ‘Uyaynah narrated to us, from Ayyub ibn Musa, from Ibn Qasit, from Sulayman ibn Yasar, that a slave woman came to some people and deceived them, and she claimed that she was a free woman, so a man married her and she bore children for him. Then they discovered that she was a slave woman. So ‘Umar judged regarding the value of her children, [saying]: "In every case of deception, there is a compensation (ghurrah)."