Roman Catechism 20.25

Chapter 20 — Part II: The Sacraments — Extreme Unction

Section 25. Dispositions for the Reception of Extreme Unction — As all care should be taken that nothing impede the. grace of the Sacrament, and as nothing is more opposed to it than the consciousness of mortal guilt, the constant practice of the Catholic Church must be observed of administering the Sacrament of Penance and the Eucharist before Extreme Unction.