Day 15 concludes Chapter 10, The Teacher of the Dharma, and opens Chapter 11, Beholding the Stūpa of Treasures.

Last month covered the three things necessary to expound the Sutra of the Lotus Flower of the Wonderful Dharma. Chapter 10 concludes with promises from the Buddha:

Medicine-King! Although I shall be in another world [after my extinction], I will manifest men and women [by my supernatural powers], dispatch them [to the expounder of the Dharmal, and have them collect people to hear the Dharma from him. I also will manifest monks, nuns and men or women of faith [by my supernatural powers], dispatch them, and have them hear the Dharma from them. These people manifested [by my supernatural powers] will hear the Dharma [from him], receive it by faith, follow it, and not oppose it. If he lives in a retired place, I will dispatch gods, dragons, demigods, gandharvas, asuras, and others to him, and have them hear the Dharma from him. Although I shall be in another world, I will cause him to see me from time to time. If he forgets a phrase of this sutra, I will tell it to him for his complete [understanding].

And in gathas:

If anyone speaks ill of you, or threatens you
With swords, sticks, tile-pieces or stones
While you are expounding this sutra,
Think of me, and be patient!

My body is pure and indestructible.
I will appear in any of many thousands of billions of worlds
During many hundreds of millions of kalpas,
And expound the Dharma to the living beings.

If a teacher of the Dharma expounds this sutra
After my extinction,
I will manifest the four kinds of devotees:
Bhiksus, bhiksunis, and men and women of pure faith,
And dispatch them to him
So that they may make offerings to him,
And that they may lead many living beings,
Collecting them to hear the Dharma [from him].

If he is hated and threatened
With swords, sticks, tile-pieces or stones,
I will manifest men and dispatch them to him
In order to protect him.

If an expounder of the Dharma
Reads and recites this sutra
In a retired and quiet place,
Where no human voice is heard,
I will show my pure and radiant body to him.
If he forgets a sentence or a phrase of this sutra,
I will tell it to him
For his complete understanding.

Anyone who expounds this sutra to the four kinds of devotees,
Or reads or recites this sutra in a retired place,
After doing these [three] virtuous things,
Will be able to see me.

If he lives in a retired place,
I will dispatch gods, dragon-kings, yaksas,
Demigods, and others to him,
And have them hear the Dharma [from him].

He will expound the Dharma with joy.
He will expound it without hindrance.
He will cause a great multitude to rejoice
Because he is protected by all the Buddhas.

Those who come to this teacher of the Dharma
Will be able to complete the Way of Bodhisattvas quickly.
Those who follow him and study will be able to see
As many Buddhas as there are sands in the River Ganges.

The Daily Dharma from March 28, 2016, comments on a portion of this:

If anyone speaks ill of you, or threatens you
With swords, sticks, tile-pieces or stones
While you are expounding this sūtra,
Think of me, and be patient!