Day 17 covers all of Chapter 12, Devadatta, and opens Chapter 13, Encouragement for Keeping this Sutra.

Having last month considered the vow of Medicine-King Bodhisattva-mahāsattva and Great-Eloquence Bodhisattva-mahāsattva, together with their twenty-thousand attendants who were also Bodhisattvas, we consider the promise of the Arhats and Śrāvakas to preach in other lands.

At that time there were five hundred Arhats in this congregation. They had already been assured of their future attainment [of Anuttara-samyak-saṃbodhi]. They said to the Buddha, “World-Honored One! We also vow to expound this sūtra [but we will expound it] in some other worlds [rather than in this Sahā-World].”

There were also eight thousand Śrāvakas some of whom had something more to learn while others had nothing more to learn. They had already been assured of their future attainment [of Anuttara-samyak-saṃbodhi]. They rose from their seats, joined their hands together towards the Buddha and vowed:

“World-Honored One! We also will expound this sūtra in some other worlds because the people of this Sahā-World have many evils. They are arrogant. They have few merits. They are angry, defiled, ready to flatter others, and insincere.”

Somewhere among the quotes I’ve set aside here is a discussion of the importance of the fact that the Arhats and Śrāvakas can’t be bothered to preach this sūtra in this Sahā-World. Only the Bodhisattvas are willing to deal with the evil people of this Sahā-World – the arrogant with few merits; they angry, defiled, ready to flatter others, and the insincere. I can’t find that quote now. But this unwillingness underscores importance of the Bodhisattvas’ Encouragement for Keeping this Sutra.