Before publication of the 1973
Rite of Eucharistic Exposition and Benediction, there was no codification of the rite. However, the guidelines for the Diocese of Rome issued under
Pope Clement XII (and hence called the
Clementine Instruction) and drawn up by the
Cardinal Vicar, Prospero Lambertini (later
Pope Benedict XIV), were widely adopted. The rite now in force for the
Latin Church requires the use of
incense at the beginning of the exposition and before the blessing, if the Blessed Sacrament is exposed in a monstrance, but not if a ciborium is used (although sometimes this is omitted). Similarly, the priest or deacon, wearing an
alb or a
surplice, should also put on a
cope and use a
humeral veil when giving the blessing with the Blessed Sacrament in a monstrance, but the cope is not required when using a ciborium. A person other than a priest or deacon authorized to expose the Eucharist for adoration cannot give the blessing with it. or the hymn
Holy God, We Praise Thy Name. (An exception is if the Divine Praises in expiation of blasphemies, "Blessed be God" etc., follow; in that case, the Blessed Sacrament is put back to the altar, and the Divine Praises are said while an altar server removes the humeral veil from the celebrant and puts it back aside, usually to the credence table. The celebrant then reposes the Blessed Sacrament once the Divine Praises are finished.)
Zucchetti are to be removed during the Benediction (and the preceding adoration) – they may only be donned again once the Blessed Sacrament is replaced. ==Eastern Christianity==