Musannaf Ibn Abi Shayba 19:688

Abu Bakr narrated to us, he said: Muhammad ibn Fudayl narrated to us, from Husayn, from Bakr, who said: A woman married her slave. It was said to her [regarding this], and she said: "Does Allah not say: '...and those whom your right hands possess' (4:24)? So this is by my right hand." And a woman married without evidence or a guardian. It was said to her [regarding this], and she said: "I am a previously married woman (thayyib), and I have authority over my own affairs." So the matter was raised to Umar. He gathered the people and asked them, and they said: "We have disputed with you by the Book of Allah, Majestic is His Majesty." Ali said: "I have disputed with you by the Book of Allah." So he (Umar) flogged each one of them one hundred lashes. Then he wrote to the provinces: "Any woman who marries her slave, or marries without a guardian, she is in the status of an adulteress."