Job 26:5 - Ellicott's Commentary On The Whole Bible

Dead things are formed. — The Hebrew word is the Rephaim, who were among the aboriginal inhabitants of the south of Palestine and the neighbourhood of the Dead Sea, and it is used to express the dead and the inhabitants of the nether world generally. The word rendered are formed probably means either are pierced or tremble: that is, they are pierced through with terror, or they tremble, with a possible reference to the state of the dead as the prey of corruption, though spoken of them where they are beyond the reach of it. All the secrets of this mysterious, invisible, and undiscoverable world are naked and open before Him — the grave lies naked and destruction is uncovered.