Adam and Eve’s sin brought death. God clearly stated that the consequences of Adam and Eve’s sin would be death.
But from the tree of the knowledge of good and evil you shall not eat, for in the day that you eat from it you will surely die (Gen. 2:17).
A man will return to the ground at death (Gen. 3:19). Adam and Eve would not live forever. Instead, they would die and be buried in the ground.