Have they hid... — Literally, they have hid for me the pit of their net, which, as it stands, can mean nothing but a “pit with a net in it,” such as was used to entrap lions and other wild beasts. But it is better to remove the word “pit” to the second clause, thus doing away with the necessity of supplying a relative, and improving the rhythm.
“ For unprovoked they hid a net for me,
Unprovoked they digged a pit for my soul.”