CCC 1268

The baptized have become "living stones" to be "built into a spiritual house, to be a holy priesthood." 1 Pet 2:5. By Baptism they share in the priesthood of Christ, in his prophetic and royal mission. They are "a chosen race, a royal priesthood, a holy nation, God's own people, that [they] may declare the wonderful deeds of him who called [them] out of darkness into his marvelous light." 1 Pet 2:9. Baptism gives a share in the common priesthood of all believers.

Read the full chapter 1. The Sacraments of Christian Initiation ¶1212–1419