佛說觀佛三昧海經 6.36

6.36

「時羅睺羅將此老母詣祇陀林，到已見佛身相紫金，歡喜合掌為佛作禮，懺悔前罪求佛出家。佛告羅睺：『汝將此母詣憍曇彌。』未至中間，羅睺為說苦、空、非常、無我等法，老母聞已頭髮自落成比丘尼，三明六通具八解脫，身昇虛空作十八變。

"Then Rāhula led this old woman to the Jetavana. Having arrived, she saw the Buddha's body with the marks of purple-gold, and rejoicing with joined palms, she paid homage to the Buddha, repented of her former sins, and asked the Buddha to go forth [as a monastic]. The Buddha said to Rāhula: 'Take this woman to Gautamī.' Before they had even arrived, Rāhula explained to her the dharmas of suffering, emptiness, impermanence, and non-self. When the old woman heard this, her hair fell out of itself and she became a nun (bhikṣuṇī). Endowed with the three knowledges, the six supernatural powers, and the eight liberations, she ascended into the sky and performed the eighteen transformations.