﴿ وَقَدِمْنَآ إِلَىٰ مَا عَمِلُوا۟ مِنْ عَمَلٍۢ فَجَعَلْنَٰهُ هَبَآءًۭ مَّنثُورًا ﴾

“for We shall have turned towards all the [supposedly good] deeds they ever wrought, and shall have transformed them into scattered dust –”

(And We shall turn unto the work they did) the good work they did in the life of this world (and make it) in the Hereafter (scattered motes) like scattered dust in the hooves of beasts; it is also said that this means: like tiny particles of dust which can be seen when, from a hole, light enters into a dark place, but these particles cannot be touched even though one can see them.