Roman Catechism 20.15

Chapter 20 — Part II: The Sacraments — Extreme Unction

Section 15. Our Saviour Himself, however, seems to have given some indication of it, when He sent His disciples two and two before Him; for the Evangelist informs us that going forth, they preached that all should do penance; and they cast out many devils, and anointed with oil many who were sick, and healed them.