'Oppressor' in the Bible

House of David, thus says Yahweh, Execute justice in the morning, and deliver him who 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 says Yahweh: Execute justice and righteousness, and deliver him who is robbed out of the hand of the oppressor: and do no wrong, do no violence, to the foreigner, the fatherless, nor the widow; neither shed innocent blood in this place.