They prepared a trap for my feet,
and they bowed down my soul;
They dug a pit before my face,
but they fell into it.
(Ps 56:7)

Me have they hurt, or themselves?
Behold He has been exalted above the Heavens, God, and behold above all the earth the Glory of the Same;
the Kingdom of Christ we see, where is the kingdom of the Jews? …
They themselves have dug a ditch, and they themselves have fallen into it.
For their persecuting Christ, to Christ did no hurt, but to themselves did hurt.
And do not suppose, brethren, that themselves alone has this befallen.
Every one that prepares a pit for his brother, it must needs be that himself fall into it
St. Augustine, commentary on the Psalms