Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) said: A slave girl came to Sayyiduna Umar (may Allah be pleased with him) and said: My master accused me and made me sit on fire until my private parts were burned. Sayyiduna Umar (may Allah be pleased with him) asked: Did he see you doing anything? She said: No. He asked: Did you confess anything? She said: No. So Sayyiduna Umar (may Allah be pleased with him) said: Bring her master. When he came, Sayyiduna Umar (may Allah be pleased with him) said: Do you punish people with the punishment of Allah? The man said: O Commander of the Believers, she was accused of immorality. He asked: Did you see her doing anything, or did she confess anything? He said: No. So Sayyiduna Umar (may Allah be pleased with him) said: By Allah, had I not heard the Messenger of Allah (peace and blessings be upon him) say, "A slave is not to be given retaliation against his owner, nor a child against his father," I would have taken retaliation from you. Then Sayyiduna Umar (may Allah be pleased with him) rebuked him and gave him a hundred lashes, and said to the slave girl: Go! You are free for the sake of Allah; you are the bondwoman of Allah and His Messenger (peace and blessings be upon him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجنايات / 15948