Where does the prayer from the boondock saints come from?

Although many think the prayer originates from the holy bible, it is not. The prayer was the creation of the Director Troy Duffy and his father. The only part of the prayer that is from the Holy Bible is the latin part, "In nomeni Patri et Filii et Spiritus Sancti", which translates to "In the name of the father, of the son, and the Holy Spirit"