“A discourse in the Arabic tongue, free of all deviousness.”
(39: 28.)
Take any one of the many surahs of the Qur’an that tackle more than one purpose. Indeed, these are the majority.
Now review it very carefully, stage by stage, and then contemplate it again, and yet again: how it begins, and how it ends.
How it reflects the contrast and balance between its constituent parts. How it relates its main themes to each other.
And how its premises lead to its conclusions, and the early parts lead to those that follow.
I maintain that no one will ever find in the line of the meanings it portrays or in the construction of its verses and sentences anything to indicate whether it was revealed all on the same occasion or on several occasions.
You will imagine that each one of the seven longest surahs was revealed in total on one occasion,
but then you will have to acknowledge the fact that all or most of them were revealed one passage at a time.