'Oppressor' in the Bible

Learn to do good.Seek justice,Rebuke the ruthless,Defend the fatherless,Plead for the [rights of the] widow [in court].

For You will break the yoke of Israel’s burden and the staff (goad) on their shoulders,The rod of their oppressor, as at the battle of Midian.

But with righteousness and justice He will judge the poor,And decide with fairness for the downtrodden of the earth;And He shall strike the earth with the rod of His mouth,And with the breath of His lips He shall slay the wicked.

that you will take up this taunt against the king of Babylon, and say,“How the oppressor has ceased [his insolence],And how the fury has ceased!

That you have forgotten the Lord your Maker,Who stretched out the heavensAnd laid the foundations of the earth,That you continually tremble with fear all day long because of the rage of the oppressor,As he takes aim to destroy?And where is the rage of the oppressor?