It may be that our souls are not that immortal and won't be until after the Day of Judgment. Examples of soul destruction and soul death . Keep in mind that God is not talking about our, fleshy human bodies since they are simply made up of dust and dirt that he scraped up from the earth. No, God is only interested in our souls . Our soul is what is important.
Death is the absence of life .
Here he is not talking about the physical body, because everyone knows that will die someday. What he is talking about is the soul. Death for the soul is not only eternal, but it is also final. The wages of sin is death , not eternal life in pain and torture . And they were judged, each one according to his works.