Three of the sacraments may not be repeated:

Three of the sacraments may not be repeated: Baptism, Confirmation and Holy Orders: their effect is permanent. This teaching has been expressed by the images of, in the West, an indelible character or mark and of, in the East, a seal (CCC 698). However, if there is doubt about the validity of the administration of one or more of these sacraments, a conditional form of conferral may be used, such as: "If you are not already baptized, I baptize you …"[20]

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