Allah informs of the horrors that will take place on the Day of Judgement. The first of these events is the blowing of fright (into the Trumpet), which will be followed by the blowing of destruction when everyone in the heavens and the earth will be struck down except whoever Allah wills. Then, after this will be the blowing of standing before the Lord of all that exists, and the resurrection, and the gathering. And this is that blowing. It is emphasized here that it is one blowing, because the command of Allah cannot be opposed or prevented, and it does not need to be repeated or stressed. Thus, Allah goes on to say,
وَيَحْمِلُ عَرْشَ رَبِّكَ فَوْقَهُمْ يَوْمَئِذٍ ثَمَانِيَةٌ (...And on that Day, the Throne of your Lord will be carried above them by eight [ angels ]....69:17). In other words, on the Day of Judgment, eight angels will bear the Throne of the Rahman above their heads. According to some of the Prophetic narratives, before the Judgment Day this task will be carried out by four angels. On the Judgment Day, four more angels will be added to carry out the task.
As to what is the Throne of the Rahman, what is its reality, its form and shape, how the angels carry it - are transcendental matters and are all beyond human intellect. Allah is beyond time, space and matter, and therefore we are not permitted to pursue these matters pertaining to Him to determine its exact meaning. The noble Companions, their pupils and the righteous elders took the attitude that they simply believed in all transcendental matters and never questioned about them. Whatever Allah means by them is the Truth. Their nature and reality are unknown.
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 12–17
Some deny the Hereafter openly, while there are others who may not explicitly deny the Hereafter, but who in their heart of hearts attach importance solely to worldly affairs. That is why there is no difference between the way of life of these people and that of those who make open denials. In essence, these two groups are the same. In the eyes of God, both of them are rejecters of the Hereafter—one group rejecting it by word of mouth and the other doing so in practice. In accordance with the law of God, all such people are going to face destruction. In the days of the prophets, this destruction was made manifest in the present world, as for their successors it will become a reality in the Hereafter.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.