And the day when the mountains shall be set in motion: that is, [the day when] We remove the mountains that are the organs [of the body] by crumbling them and making them as 'scattered dust' [Q. 25:23]; and you will see the earth, that is the body, exposed, manifest, even and flat, simple as it had [once] been without form or compound, pure dust. And We shall gather them: the pronoun ['them'] either refers to the aforementioned faculties or to individual human beings, such that We will not leave out anyone of them, ungathered.
