Day 17 covers all of Chapter 12, Devadatta, and opens Chapter 13, Encouragement for Keeping this Sutra.
Having last month considered Śāriputra’s objection to the dragon girl’s plan to become a buddha, we witness the girl’s transformation into a Buddha and conclude Chapter 12.
At that time the daughter of the dragon-king had a gem. The gem was worth one thousand million Sumeru-worlds. She offered it to the Buddha. The Buddha received it immediately. She asked both Accumulated-Wisdom Bodhisattva and Venerable Śāriputra, “I offered a gem to the World-Honored One. Did he receive it quickly or not?”
Both of them answered, “Very quickly.”
She said, “Look at me with your supernatural powers! I will become a Buddha more quickly.”
Thereupon the congregation saw that the daughter of the dragon-king changed into a man all of a sudden, performed the Bodhisattva practices, went to the Spotless World in the south, sat on a jeweled lotus-flower, attained perfect enlightenment, obtained the thirty-two major marks and the eighty minor marks [of the Buddha], and [began to] expound the Wonderful Dharma to the living beings of the worlds of the ten quarters. Having seen from afar that [the man who had been] the daughter of the dragon-king had become a Buddha and [begun to] expound the Dharma to the men and gods in his congregation, all the living beings of the Sahā-World, including Bodhisattvas, Śrāvakas, gods, dragons, the [six other kinds, that is, in total] eight kinds of supernatural beings, men, and nonhuman beings, bowed [to that Buddha] with great joy. Having heard the Dharma [from that Buddha], [a group of] innumerable living beings [of that world] understood the Dharma, and reached the stage of irrevocability, and [another group of] innumerable living beings [of that world] obtained the assurance of their future attainment of enlightenment. At that time the Spotless World quaked in the six ways. Three thousand living beings of the Sahā World reached the stage of irrevocability, and another group of three thousand living beings [of the Sahā-World] aspired for Bodhi, and obtained the assurance of their future attainment of enlightenment. The Accumulated-Wisdom Bodhisattva, Śāriputra, and all the other living beings in the congregation received the Dharma faithfully and in silence.