The strength of his skin. — This verse should probably be rendered, “It shall devour the members of his body, even the firstborn of death shall devour his members;” and by the “firstborn of death” is probably to be understood some wasting disease such as Job’s, the phrase being so used as a euphemism.
Related Commentaries of Job 18:13
Job 18:13
13 It shall devour the strengthe of his skin: even the firstborn of death shall devour his strength.