Dhammapada Verse 160
The Story of the Mother of Kumarakassapa
Once, a young married woman asked permission from her husband to become a bhikkhuni. Through ignorance, she went to join some bhikkhunis who were the pupils of Devadatta. This young woman was pregnant before she became a bhikkhuni, but she was not aware of the fact at that time. But in due course, the pregnancy became obvious and the other bhikkhunis took her to their teacher Devadatta. Devadatta ordered her to go back to the household life. She then said to the other bhikkhunis, "I have not intended to become a bhikkhuni under your teacher Devadatta; I have come here by mistake. Please take me to the Jetavana monastery, take me to the Buddha."