"أفلا يعلم"، أي: أفلا يعلم هذا الإنسان، "إذا بعثر"، أي: أثير وأخرج، "ما في القبور" من الموتى.
Does this human, deceived by the worldly life, not know that when Allah will resurrect the dead from their graves and take them out of the earth to take them to account and requite them, that the matter will not be as he imagines?