Chapter 16 — Part II: The Sacraments — Baptism
Section 40. Baptism Made Obligatory After Christ's Resurrection — The second period to be distinguished, that is, the time when the law of Baptism was made, also admits of no doubt. Holy writers are unanimous in saying that after the Resurrection of our Lord, when He gave to His Apostles the command to go and teach all nations: baptising them in the name of the Father, and of the Son, and of the Holy Ghost, the law of Baptism became obligatory on all who were to be saved.