CCC 1519
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The celebration of the sacrament includes the following principal elements: the "priests of the Church" Jas 5:14. - in silence - lay hands on the sick; they pray over them in the faith of the Church Cf. Jas 5:15. - this is the epiclesis proper to this sacrament; they then anoint them with oil blessed, if possible, by the bishop. These liturgical actions indicate what grace this sacrament confers upon the sick.
Read the full chapter 2. The Sacraments of Healing ¶1420–1532