Then, referring to another speciality of that Day, it says:...
Then, referring to another speciality of that Day, it says: "And the mountains will be like carded wool.” The term /ihn/ means 'colored wool', and the term /manfus/, based on /nafs/, means 'teased, carded (wool)’ which is usually done by special means on a wool-carder.
It was mentioned before that according to the different verses of Qur'an, at the threshold of the Hereafter, first, mountains will move, then, they will cleave as under and break into pieces, and finally they will turn into dust and scatter in the air, which, in this verse, is likened to colored-carded wool; the wool which travels with storms and will be seen only by its color. This is the last stage in the destruction of the mountains.
This idea may also refer to the various colors of the mountains, because the mountains, on the earth, range in color and each has a special color. In any case, this meaning shows that the above verses speak about the first stage of the Hereafter; that is, the stage of destruction and the end of the world. Then, reference is made to the Resurrection stage and the reviving of the dead and their division into two groups.
It says: "So, he whose scales (of good deeds) are heavy," "He will be in a life well-pleasing.” “And he whose scales (of good deeds) are light,” “Then his abode will be 'Hawiyah' (the abyss).” "And what makes you know what that (abyss) is?" "(It is) a Raging Fire.” The term /mawazin/ is the plural form of /mizan/ which means 'scales, balance'; an instrument which was used for weighing material things, at first, and then, figuratively, was used for measuring spiritual things, too.
Some believe that, on That Day, the deeds of Man will appear in the form of corporeal beings which can be weighed, and they will actually be weighed by deed-scales. It is also considered that the record, itself, may be weighed and if it contains good deeds recorded, it weighs heavy, otherwise, it is light or weightless. But, apparently, it does not need these explanations.