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Pope Saint Paul VI (3 April 1969): “Although the text of the Roman Gradual—at least that which concerns the singing—has not been changed, the Entrance antiphons and Communions antiphons have been revised for Masses without singing.”

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Views from the Choir Loft

“Simultaneous Fulfillment” of Mass Obligation?

Jeff Ostrowski · November 24, 2017

3830 Calendar CCORDING to current USA law, a Catholic may fulfill the Sunday obligation by attending Mass on Saturday evening, sometimes called an “anticipated” or “vigil” Mass. The readings and propers chosen for Saturday night make no difference. (The same holds true for any Holy Day of Obligation.)

Christmas falls on a Monday in 2017.

Can you “double dip” the fulfillment of your Mass obligation? In other words, does attending Mass on Sunday evening fulfill both the Sunday and Monday obligations? Reading the Code of Canon Law, we might erroneously believe this:

Can 1248 • A person who assists at a Mass celebrated anywhere in a Catholic rite either on the feast day itself or in the evening of the preceding day satisfies the obligation of participating in the Mass.

For years, this has caused tremendous confusion online. Many authors feel we must attend Mass twice but struggle to provide documentation. Some appeal to “the common and constant opinion of learned persons” argument. But the Congregation for the Clergy has already clarified the matter of simultaneous fulfillment by the faithful:

328 simulatneous-fulfillment-mass-obligation DOUBLE DIPPING

    * * Source • USCCB Document on “Double-Dipping” (1974)


I’m not a canon lawyer, but this document seems to leave no room for “double dipping” (as Andrew Motyka dubbed it several years ago). Therefore, you must attend Mass twice—once for Sunday, once for Christmas—but there are many ways this can lawfully be done. You could go Saturday night and Monday night. Or you could go Sunday evening and Christmas morning. My personal preference is to go Sunday morning and Monday morning.

For the record, rules like these apply to the Extraordinary Form as well. (Similar to how EF Catholics are bound by the current laws on fasting and not, say, the 1950s regulations.)

HIS DUBIUM was answered at the precise moment we would expect. After all, “anticipated fulfillment” of Mass obligation was a new concept, and (to be brutally honest) ruptured the traditional practice of the Church, which had always celebrated vigils on the preceding morning. It should be noted—and cannot be repeated enough—that the choice of formularies makes no difference when it comes to fulfilling one’s obligation to attend Mass. As the above document points out:

On the evening of the Fourth Sunday of Advent, when this falls on December 24, it is possible to have both the evening Mass of the Sunday and the vigil Mass of Christmas. In the same way, when Christmas occurs on a Saturday, the evening Mass might be either that of Christmas or the anticipated Mass for the Feast of the Holy Family.

That is why one can attend a Wedding (“Nuptial Mass”) on Saturday evening and fulfill one’s Sunday obligation, although I believe such a Mass cannot begin too early in the afternoon.


Fun fact : Archbishop Bugnini, in that 1974 document, clearly says nobody can be forced to receive Holy Communion in the hand:

Furthermore, even when an Episcopal Conference petitions the Holy See for the faculty to distribute communion in the hand (see Memoriale Domini, May 29, 1969), this manner of reception can in no way be imposed on the faithful. Rather, the freedom and possibility of receiving communion in the traditional manner must always be granted.

It was recently clarified by the USCCB that kneeling of Communion cannot be denied.

The following are offered for your consideration:

    * *  PDF Download • Diocese of Tulsa, Oklahoma

    * *  PDF Download • Archdiocese of Atlanta, Georgia

    * *  PDF Download • Diocese of Birmingham, Alabama

    * *  PDF Download • USCCB Statement on “Double Dipping”

    * *  PDF • “Evening Masses and Days of Obligation” (58 pages)

Opinions by blog authors do not necessarily represent the views of Corpus Christi Watershed.

Filed Under: Articles Tagged With: anticipated Mass, simultaneous Mass obligation, vigil Mass Last Updated: January 1, 2020

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About Jeff Ostrowski

Jeff Ostrowski holds his B.M. in Music Theory from the University of Kansas (2004). He resides with his wife and children in Michigan. —(Read full biography).

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Corpus Christi Watershed

President’s Corner

    “Sanctus VIII” • Organ Accompaniment
    A few days ago, I composed this organ harmonization for SANCTUS VIII. This Mass is traditionally called Missa de ángelis or “Mass of the angels.” In French, it is Messe de Anges. You can evaluate my attempt to simultaneously accompany myself on the pipe organ (click here) while singing the melody. My parish is currently singing this setting.
    —Jeff Ostrowski
    Music List • (5th Sund. Ordinary Time)
    Readers have expressed interest in perusing the ORDER OF MUSIC I’ve prepared for this coming Sunday, 8 February 2026, which is the 5th Sunday in Ordinary Time (Year A). If such a thing interests you, feel free to download it as a PDF file. You will probably notice it isn’t as ‘complete’ or ‘spiffy’ as usual, owing to some difficulties which took place this week.
    —Jeff Ostrowski
    PDF • “Communion” (5th Sunday in Ordin.)
    The COMMUNION ANTIPHON for this coming Sunday, 8 February 2026—which is the 5th Sunday in Ordinary Time (Year A)—is truly delightful. You can download the musical score completely free of charge. This text will be familiar to altar boys, because it’s PSALM 42. The Feder Missal makes the following claim about that psalm: “A hymn of a temple musician from Jerusalem: he is an exile in a heathen land, and he longs for the holy city and his ministry in the Temple there. The Church makes his words her own.”
    —Jeff Ostrowski

Quick Thoughts

    “Reminder” — Month of Febr. (2026)
    On a daily basis, I speak to people who don’t realize we publish a free newsletter (although they’ve followed our blog for years). We have no endowment, no major donors, no savings, and refuse to run annoying ads. As a result, our mailing list is crucial to our survival. It couldn’t be easier to subscribe! Just scroll to the bottom of any blog article and enter your email address.
    —Jeff Ostrowski
    PDF Chart • “Plainsong Rhythm”
    I will go to my grave without understanding the lack of curiosity so many people have about the rhythmic modifications made by Dom André Mocquereau. For example, how can someone examine this single sheet comparison chart and at a minimum not be curious about the differences? Dom Mocquereau basically creates a LONG-SHORT LONG-SHORT rhythmic pattern—in spite of enormous and overwhelming manuscript evidence to the contrary. That’s why some scholars referred to his method as “Neo-Mensuralist” or “Neo-Mensuralism.”
    —Jeff Ostrowski
    PDF • “O Come All Ye Faithful” (Simplified)
    I admire the harmonization of “Adeste Fideles” by David Willcocks (d. 2015), who served as director of the Royal College of Music (London, England). In 2025, I was challenged to create a simplified arrangement for organists incapable of playing the authentic version at tempo. The result was this simplified keyboard arrangement (PDF download) based on the David Willcocks version of “O Come All Ye Faithful.” Feel free to play through it and let me know what you think.
    —Jeff Ostrowski

Random Quote

What earlier generations held as sacred, remains sacred and great for us too, and it cannot be all of a sudden entirely forbidden or even considered harmful.

— ‘His Holiness, Pope Benedict XVI (7 July 2007)’

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  • “Let the Choir Have a Voice” • Jeff Ostrowski’s Essay on Choral Music in the Catholic Mass

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