'Adversary' in the Bible

if I have rewarded evil to him who was at peace with me (yes, if I have delivered him who without cause was my adversary),

You make us turn back from the adversary. Those who hate us take spoil for themselves.

Give us help against the adversary, for the help of man is vain.

How long, God, shall the adversary reproach? Shall the enemy blaspheme your name forever?

They didn't remember his hand, nor the day when he redeemed them from the adversary;

Let the redeemed by Yahweh say so, whom he has redeemed from the hand of the adversary,

Set a wicked man over him. Let an adversary stand at his right hand.