'Oppressor' in the Bible

O house of David, thus saith Jehovah, Execute justice in the morning, and deliver him that is robbed out of the hand of the oppressor, lest my wrath go forth like fire, and burn so that none can quench it, because of the evil of your doings.

Thus saith Jehovah: Execute ye justice and righteousness, and deliver him that is robbed out of the hand of the oppressor: and do no wrong, do no violence, to the sojourner, the fatherless, nor the widow; neither shed innocent blood in this place.