Wajaat sakratu almawti bilhaqqi thalika ma kunta minhu taheed (surah Qaf: 19)

Tafseer Tafheem-ul-Quran by Syed Abu-al-A'la Maududi

(50:19) Lo, the agony of death has indeed come with the Truth. *22 That is what you had sought to avoid. *23

Wa jaaa`at kullu nafsim ma`ahaa saaa`iqunw wa shaheed

*22) "To come with the truth" implies that the agony of death is the starting point when the reality which had remained concealed in the world, begins to be uncovered. At this point man starts seeing clearly the other world of which the Prophet had forewarned him. Here, man also comes to know that the Hereafter is the very truth, and also this whether he is entering this second stage of life as favored or damned.
*23) That is, "This is the same reality which you refused to believe. You desired that you should live and go about as an unbridled rogue in the world, and there should be no other life after death, in which you may have to suffer for the consequences of your deeds, That is why you shunned the concept of the Hereafter and were not at all inclined to believe that this next world would ever be established. Now, you may see that the same next world is unveiling itself before you.".