'Accuser' in the Bible

"If only I had someone to hear me! Here is my signature -- let the Almighty answer me! If only I had an indictment that my accuser had written.

Appoint an evil man to testify against him! May an accuser stand at his right side!

The one who vindicates me is close by. Who dares to argue with me? Let us confront each other! Who is my accuser? Let him challenge me!