'Adversary' in the Bible

Or, ‘Deliver me from the hand of the adversary,’Or, ‘Redeem me from the hand of the tyrants’?

“His anger has torn me and hunted me down,He has gnashed at me with His teeth;My adversary glares at me.

“Oh that I had one to hear me!Behold, here is my signature;Let the Almighty answer me!And the indictment which my adversary has written,