لِأَنَّ مِنْهُمْ مَنْ لَا يُرِيدُ اللَّهُ تَعَالَى تَعْذِيبَهُ فَلَا يُعَذَّبُ
For among them are some whom Allah does not will to punish, and so they are not punished.
Two propositions must be distinguished: the reality of punishment and a definite judgment that a particular individual will receive it. Affirming the first does not provide grounds for freely asserting the second.
A warning establishes that a sin may warrant punishment. It does not mean we know all circumstances relevant to a named sinner, such as repentance, forgiveness, or divine will. Thus the reality of grave punishment does not entail that every sinful believer necessarily suffers it.