Albert Barnes Commentary Job 8:3

"Doth God pervert justice? Or doth the Almighty pervert righteousness?" — Job 8:3 (ASV)

Does God pervert judgment? That is, does God afflict people unjustly? Does he show favor to the evil and punish the good? Bildad here undoubtedly refers to Job and supposes that he had brought this charge against God. But he had not done it in so many words. He had complained of the severity of his sufferings and had indulged in irreverent language toward God, but he had not advanced the charge openly that God had perverted right.

Bildad strenuously maintains that God would do right. His argument is based on the supposition that God would deal with people in this life according to their character; thus, he infers that Job must have been guilty of some great wickedness, that punishment should come upon him in this manner.