אִם־בָּנֶ֥יךָ חָֽטְאוּ־ל֑וֹ וַֽ֝יְשַׁלְּחֵ֗ם בְּיַד־פִּשְׁעָֽם׃
Haben deine Kinder gegen ihn gesündigt, so ließ er sie hinfahren wegen ihrer Missetat.
Rashi on Job
He sent them away in the hands of their transgression Through their transgression. (The transgression) became the agent to carry them off.
Malbim on Job
Job's children had sinned and despite Job's expiation on their behalf, they had been justly punished. But as regards truly righteous persons such as Job himself, Bildad expounds the idea that they are made to suffer presently in order that they might benefit later.