Musannaf Ibn Abi Shayba 19:423

Abu Bakr narrated to us, he said: Ibn Mahdi narrated to us, from Sufyan, from Qays ibn Muslim, from Tariq ibn Shihab, that a woman committed adultery. Umar said: "I see that she used to pray at night, so she became humble, and she bowed, and she prostrated. Then one of the seducers came to her and overpowered her." Umar sent for her, and she said just as Umar had said, so he let her go.