مِمَّا خَطِيئَاتِهِمْ أُغْرِقُوا فَأُدْخِلُوا نَارًا
Because of their sins they were drowned, then admitted to a Fire. (Qurʾan 71:25)
The connective fa- in “then admitted” is read in the classical argument as joining entry into Fire to the prior event of drowning. Since drowning occurred in this life, the following punishment is cited as support for an intermediate postmortem state.
This reading draws on the sequence expressed by the verse. Its aim is not to specify a physical mechanism for punishment but to establish a meaningful mention of punishment following death.