This is Bildad first speech in this debate.
He concluded that Job was accusing God of injustice. (v3)
He said Job’s children died because they have sinned against God, and thus received penalty of their sin. (v4)
Bildad get his understanding of how God would punished the sinners and reward those the righteous from previous generations. (v8-10).
He accused Job of forgetting God (v13)
He alluded that Job was not blameless because God does not reject a blameless man (v20).