Roman Catechism 28.38

Chapter 28 — Part III: The Decalogue — The Fifth Commandment

Section 38. Of these remedies the first and greatest is the example of the Redeemer, which we should set before our eyes as a model for imitation. For He, in whom even suspicion of fault could not be found, when scourged with rods, crowned with thorns, and finally nailed to a cross, uttered that most charitable prayer: Father, forgive them, for they know not what they do. And as the Apostle testifies: The sprinkling of his blood speaketh better than Abel.