Roman Catechism 16.29

Chapter 16 — Part II: The Sacraments — Baptism

Section 29. Baptism In The Name Of Christ — If at any time the Apostles baptised in the name of the Lord Jesus Christ only, we can be sure they did so by the inspiration of the Holy Ghost, in order, in the infancy of the Church, to render their preaching more illustrious by the name of Jesus Christ, and to proclaim more effectually His divine and infinite power. If, however, we examine the matter more closely, we shall find that such a form omits nothing which the Saviour Himself commands to be observed; for he who mentions Jesus Christ implies the Person of the Father, by whom, and that of the Holy Ghost, in whom, He was anointed.