Exegesis of the saying of Allah the Exalted: "This is the Day of Division, which you used to deny."

"This is the Day of Division," meaning the Day of Reckoning and recompense. It is the Day of Division among the creation, which you used to deny. This phrase may be from their speech, or it may be from the speech of the angels. If it is from their speech, the meaning is that some of them say to others, "This is the Day of Division, which you used to deny." Some say this to others as a rebuke, a source of regret, and a condemnation. If it is from the speech of the angels, there is no problem with it, for they are addressing a people who used to deny it. And His saying after this, "the Day of Judgment," is because when people are judged, reckoned, and recompensed, some of them are separated from others: a group in Paradise and a group in the blazing Fire. It may separate a man from his father, a man from his mother, and a man from his relatives. These go to Paradise and these go to the Fire. Therefore, it is called the Day of Division because on it the creation are separated, with some being directed to the Fire and some being directed to Paradise.
It is also called the Day of Division because it separates the creation by judging between them, taking the right of the oppressed from the oppressor, just as a judge in this world separates between litigants by giving the oppressed his right from the oppressor. It is called the Day of Division because people are separated from one another: a group in Paradise and a group in the blazing Fire. It is called the Day of Division because it separates the creation by judging between them with justice.
And His saying "you used to" means in the past. As for now, they believe in it, for they said, "This is the Day of Judgment." But in the past, they used to deny this Day, saying, "How is it possible that the creation will be resurrected after they were bones and dust?" If someone asks, "What is the benefit of His saying ?" We say the benefit is to increase their regret. For when it is said to them, "which you used to deny," they will regret and say, "Oh, if only we had not denied it." This adds pain to their souls. This is from one aspect. From another aspect, it is a rebuke of these people and a blame for their denial, since they denied the truth. So there are two benefits: the first benefit is the increase of regret in them, and the second benefit is the rebuke and blame for their denial of the truth.