Job 26:4 (ESV)

4 With whose help have you uttered words, and whose breath has come out from you?

Eliphaz had claimed that his words were inspired by God (Job 4:12–17; Job 15:11; Job 22:22). Now that Bildad has echoed Eliphaz’ words (according to which no one can be righteous before God), Job mockingly asks Bildad where he had got his revelation from. Clearly, Job does not believe that either Eliphaz or Bildad had received their words from God.