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The “Order of the Roman Liturgical Books” and the Arrangement of Mass Readings

An explanation, organized by the standard of the Ordo Lectionum Missae, of what the “order of the Roman liturgical books” spoken of in the Bible translation guidelines means in the Lectionary for Mass.

Created: 2026-07-08 Scope: the Lectionary for Mass of the Roman Rite Basis: OLM editio typica altera, 1981
Back to the Lectionary section of the guidelines Read the 2021 Decree text

1. Summary

The “order of the Roman liturgical books” referred to in the translation guidelines does not mean arranging the biblical text in an arbitrary book-by-book sequence or a local editorial order. For the Lectionary for Mass, the standard is the reading arrangement, the text boundaries, the titles, the responsorial psalms, the Gospel acclamations, the incipits, and the system of directives of the Roman Rite editio typica liturgical books — especially the Ordo Lectionum Missae (Order of Readings for Mass, editio typica altera, 1981).

A vernacular Lectionary is therefore not adequate merely by getting right “which biblical text was translated.” On which day, at which liturgical rank, in which cycle, and in which Common, Proper, or Ritual Mass a given reading is placed; where the passage begins and ends; and the responsorial psalm, the titles, and the directives — all of these must agree with the structure of the Roman liturgical books.

The decisive test is not the chapter-and-verse order of the Bible, but whether the liturgical day, the cycle, the category, the passage boundaries, the responsorial psalm and acclamation, and the titles and incipits follow the order of the OLM.

2. Direct evidence

  1. The 2021 Decree of the Congregation for Divine Worship and the Discipline of the Sacraments explains that the “delineation and arrangement of the biblical text” in a Lectionary must agree with the editio typica. Article 46 of the same document also states that the content of the confirmation is to verify whether the delineation and editing of the biblical text agree with the Roman Rite editio typica liturgical books.

    → Source: “2021 Decree implementing Canon 838,” arts. 29 and 46 · Read the text · CBCK decree

  2. The General Instruction of the Roman Missal, no. 391, states that the Conference of Bishops must approve the translation of the biblical texts used at Mass and the Lectionary for Mass, and publish them after receiving the confirmation of the Apostolic See, following in this the norms of the Order of Readings for Mass.

    → Source: General Instruction of the Roman Missal, no. 391 · Read the related document · Vatican GIRM

  3. Liturgiam authenticam, no. 39, directly instructs that the delineation of the biblical pericopes is to conform entirely to the Ordo Lectionum Missae. No. 36 requires uniformity of the approved translation used throughout the liturgical books within a given territory; no. 37 explains that the Nova Vulgata is the point of reference for the canonical text and the order of verses; and no. 45 gives directions for handling the incipits and titles of the OLM.

    → Source: “Liturgiam authenticam,” nos. 36–37, 39, 45 · Read the text · Vatican EN

  4. The footnotes of the official English text of the 2021 Decree identify the reference work of the Lectionary as the Ordo Lectionum Missae, editio typica altera 1981 and its Praenotanda. Accordingly, when interpreting the “order of the Roman liturgical books” in the context of the Lectionary for Mass, the 1981 editio typica of the OLM is the direct standard.

    → Source: official English text of the “2021 Decree implementing Canon 838,” footnotes 22 and 39 · Read the text · Vatican EN

3. Six things the OLM structure means

1. Sundays and Solemnities: a three-year cycle

The readings for Sundays and major feasts are arranged in a three-year cycle, A/B/C. Generally Year A centers on Matthew, Year B on Mark, and Year C on Luke, while the Gospel of John is placed in the seasons of Lent and Easter, on certain Solemnities, and in some special texts.

2. Weekdays: a two-year cycle

The first reading on weekdays in Ordinary Time is arranged in a two-year cycle, I/II. Ordinarily Year I is used in odd-numbered years and Year II in even-numbered years, while the Gospel generally follows a semi-continuous reading structure that repeats each year.

3. Proper, Saints, Commons, Ritual, Votive, and Masses for the Dead

Beyond Sundays and weekdays, the OLM also fixes the reading sets and rules of selection for the Proper of Seasons, the Proper of Saints, the Commons of Saints, Masses for Various Needs and Votive Masses, Ritual Masses, and Masses for the Dead.

4. Pericope boundaries

A pericope is the passage of Scripture proclaimed as a single unit in the liturgy. By the standard of the OLM, what matters is not only “which chapter and verse of which book” but also “where it begins and where it is cut off.”

5. The pairing of the responsorial psalm and the Gospel acclamation

The Mass readings are arranged as a liturgically joined unit of first reading, responsorial psalm, second reading, Gospel acclamation, and Gospel. The responsorial psalm is not a mere appended list of psalms but a response text linked to that particular reading day.

6. Incipits and titles

An incipit such as “At that time…” is a phrase that opens the liturgical proclamation, distinct from the chapter-and-verse translation. Liturgiam authenticam, no. 45, gives directions for handling incipits where the OLM prescribes them, and also requires the preservation of titles that correspond to the biblical text.

Ancillary devices such as the Praenotanda, the rules of selection, the indication of liturgical categories, and the reading-numbering system are also part of the editorial order that makes the Lectionary actually usable.

4. How they relate

  • The Roman Missal is the central liturgical book containing the prayers, the Order of Mass, and the General Instruction for the celebration of Mass.
  • The Lectionary for Mass is a separate liturgical book containing the Scripture readings and responsorial psalms proclaimed at Mass; together with the Missal and its General Instruction it forms the structure of the Roman Rite Mass.
  • The Ordo Lectionum Missae is the standard order of this Lectionary. The 2021 Decree and the GIRM presuppose that a vernacular Lectionary is to be approved and confirmed in conformity with this norm.
  • A Conference of Bishops uses an approved Bible translation, yet must produce the Lectionary so that it agrees with the delineation, arrangement, and editorial structure of the Roman editio typica liturgical books.

5. Practical criteria for judgment

To see whether a given item matches the “order of the Roman liturgical books” spoken of in the translation guidelines, check the following.

  1. Is the reading placed on the OLM’s corresponding liturgical day, category, and cycle?
  2. Do the beginning and end of the text, the marks of omission, and the chapter-and-verse boundaries match the OLM?
  3. Are the responsorial psalm, the Gospel acclamation, and the incipit before the Gospel kept together with that reading?
  4. Have the titles, the rubrics, the Praenotanda, and the rules of selection not been omitted?
  5. Even when the wording of the local Bible translation is used, has the arrangement and editorial structure of the editio typica liturgical book been left unchanged?

7. What we could not verify

Within the scope of this check, we were not able to access the original text of the 1981 editio typica of the Ordo Lectionum Missae in a standalone HTML/PDF form on the Vatican website. We therefore did not fabricate an online source text of the OLM itself; we relied only on the way in which officially published documents verified as HTTP 200 — the Vatican 2021 Decree, Liturgiam authenticam, the GIRM, and the CBCK materials — refer to the OLM.