Job 27:12

12 If you yourselves have all seen this,
Why in the world ^{▼▼ The interrogative uses the demonstrative pronoun in its emphatic position: “Why in the world…?” (IBHS 312–13 #17.4.3c).} do you continue this meaningless talk? ^{▼▼ The text has the noun “vain thing; breath; vapor,” and then a denominative verb from the same root: “to become vain with a vain thing,” or “to do in vain a vain thing.” This is an example of the internal object, or a cognate accusative (see GKC 367 #117.q). The LXX has “you all know that you are adding vanity to vanity.”}