The Boondock Saints (1999) | Courtroom Sentence

Two Irish brothers accidentally kill mafia thugs. They turn themselves in and are released as heroes. They then see it as a calling by God and start knocking off mafia gang members one by one. Willem Dafoe plays the detective trying to figure out the killings, but the closer he comes to catching the Irish brothers, the more he thinks the brothers are doing the right thing.
Sean Patrick Flanery as Connor MacManus, Norman Reedus as Murphy MacManus.

And Shepherds we shall be For Thee my Lord, for Thee.
Power hath descended forth from Thy hand Our feet may swiftly carry out Thy commands.
So we shall flow a river forth to Thee, And teeming with souls shall it ever be.
In nomine Patri, et Filii, et Spiritus Sancti