He probably says "E nomini patris, et fili, et spiritus sancti"....it's part of the Latin mass....."In the name of the father, the son, and the holy ghost." That Boondock Saints movie is pretty cool in that the prayer that the brothers have is pretty similiar to the one my Irish family used to say....I remember it by heart.

"And shepherds we shall be, for thee my lord, for thee. Power hath descended forth from thy hand so our feet may swiftly carry out thy command. And we shall flow a river forth to thee, and teaming with souls shall it ever be."