Day 13 covers all of Chapter 8, The Assurance of Future Buddhahood of the Five Hundred Disciples.

Having last month learned of Pūrṇa’s past practices in gāthās, we learn of his future as a Buddha named Dharma-Brightness.

In the future also he will make offerings
To innumerable Buddhas, protect their right teachings,
Help them propagate their teachings,
And purify their worlds.

He will always fearlessly expound the Dharma
With expedients.
He will save countless living beings
And cause them to have the knowledge of all things.

He will make offerings to many Tathāgatas
And protect the treasure-store of the Dharma.
After that he will be able to become a Buddha
Called Dharma-Brightness.

His world will be called Good-Purity.
It will be made of the seven treasures.
His kalpa will be called Treasure-Brightness.
There will be Bodhisattvas [in his world],
Many hundreds of millions in number.
They will have great supernatural powers.
They will be powerful and virtuous.
They will be seen throughout that world.

Innumerable Śrāvakas will organize the Saṃgha.
They will have the three major supernatural powers,
The eight emancipations,
And the four kinds of unhindered eloquence.

The living beings of that world will have no sexual desire.
They will be born without any medium.
They will be adorned with the marks [of the Buddha].
They will not think
Of any other food [than the two kinds of food]:
The delight in the Dharma, and the delight in dhyāna.
There will be neither women nor evil regions
In that world.

Pūrṇa Bhikṣu will be able to obtain
All these merits,
And have his pure world
Inhabited by many sages and saints.
I have innumerable things to say of him.
I have told you only a few of them.

See The Ideal Life