An Interruption to verify the Truthfulness of the Prophet

This is presented in the middle of the story to affirm the story itself. It is as if Allah, the Exalted, is saying to Muhammad , "Or do these obstinate disbelievers say that he fabricated this and invented it himself"

قُلْ إِنِ افْتَرَيْتُهُ فَعَلَىَّ إِجْرَامِى

Fourthly, it was stated: In your sight these poor people may appear lowly and disgraceful. But, I cannot say as you say that Allah Ta'ala will not bless them with what is good, because good relates to one's heart, not wealth, and only Allah knows the secrets of hearts and He knows whose heart is worthy of receiving good and whose heart is not.

Then, it was said: If I too were to start calling them lowly and disgraceful, I too would become unjust.