"The hunter is taken in his own snare, as the great Psalmist says"
An Illustrated Psalm (Psalm 23)
Public DomainAn Illustrated Psalm (Psalm 23) - Credit: wikimedia commons

This is a reference to a line from Psalm 69 (line 22):

Let their table become a snare before them: and that which should have been for their welfare, let it become a trap.

 

A psalm is a sacred poem of praise or faith.