Adam Clarke on Job 34:20

In a moment shall they die - Both are equally dependent on the Almighty for their breath and being; the mighty as well as the poor. If the great men of the earth have abused their power, he sometimes cuts them off by the most sudden and unexpected death; and even at midnight, when in security, and least capable of defense, they are cut off by the people whom they have oppressed, or by the invisible hand of the angel of death. This appears to be spoken in reference to Eastern tyrants, who seldom die a natural death.