IV. The Effects of the Celebration of This Sacrament

1523
A preparation for the final journey. If the sacrament of anointing of the sick
is given to all who suffer from serious illness and infirmity, even more
rightly is it given to those at the point of departing this life; so it is also
called sacramentum exeuntium (the sacrament of those departing).¹³⁸ The
Anointing of the Sick completes our conformity to the death and Resurrection of
Christ, just as Baptism began it. It completes the holy anointings that mark
the whole Christian life: that of Baptism which sealed the new life in us, and
that of Confirmation which strengthened us for the combat of this life. This
last anointing fortifies the end of our earthly life like a solid rampart for
the final struggles before entering the Father’s house.¹³⁹

From The Catechism of the Catholic Church – rosary.team

Original Link: https://www.vatican.va/archive/ENG0015/__P4N.HTM