“Without cause
They hid their net for me.
Without cause
They dug a pit for my life.
Let ruin come upon them unawares!
Let the net that they hid
Ensnare them!
Let them fall in!
Let it be to their ruin!”
David noted that these things were done to him without a good cause. They hid a net to trap him. They dug a pit to put an end to his life. David wanted them to get caught in their own nets. He wanted them to fall into the pits that they had dug out to get him. This was to be their ruin. Clearly David was vindictive here because he believed that he was right because they did not have a good cause against him.