The enemies (Ps 56:5-56:7)

“All day long they seek to injure my cause.

All their thoughts are against me for evil.

They stir up strife.

They lurk.

They watch my steps.

They hoped to have my life.

So repay them for their crime!

In wrath

Cast down the peoples,

O God!”

The enemies of David, in particular the men of King Saul, were after David.  They sought to injure him.  They stirred up evil strife.  They lurked watching his steps in hopes that they could take his life.  David wanted God to repay his enemies for their crimes.  He wanted God to get mad and cast out these people.