Here is a link to a statement by the Holy See on the Assyrian LIturgy of Ss Addai and Mari:
vatican.va/roman_curia/pontifical_councils/chrstuni/documents/rc_pc_chrstuni_doc_20011025_chiesa-caldea-assira_en.html
Here is a pertinent passage:
**In the first place, the Anaphora of Addai and Mari is one of the most ancient Anaphoras, dating back to the time of the very early Church; it was composed and used with the clear intention of celebrating the Eucharist in full continuity with the Last Supper and according to the intention of the Church; its validity was never officially contested, neither in the Christian East nor in the Christian West.
Secondly, the Catholic Church recognises the Assyrian Church of the East as a true particular Church, built upon orthodox faith and apostolic succession. The Assyrian Church of the East has also preserved full Eucharistic faith in the presence of our Lord under the species of bread and wine and in the sacrificial character of the Eucharist. In the Assyrian Church of the East, though not in full communion with the Catholic Church, are thus to be found “true sacraments, and above all, by apostolic succession, the priesthood and the Eucharist” (U.R., n. 15). Secondly, the Catholic Church recognises the Assyrian Church of the East as a true particular Church, built upon orthodox faith and apostolic succession. The Assyrian Church of the East has also preserved full Eucharistic faith in the presence of our Lord under the species of bread and wine and in the sacrificial character of the Eucharist. In the Assyrian Church of the East, though not in full communion with the Catholic Church, are thus to be found “true sacraments, and above all, by apostolic succession, the priesthood and the Eucharist” (U.R., n. 15).
Finally, the words of Eucharistic Institution are indeed present in the Anaphora of Addai and Mari, not in a coherent narrative way and ad litteram, but rather in a dispersed euchological way, that is, integrated in successive prayers of thanksgiving, praise and intercession.**<<
Here is an excellent translation by the Assyrian Church:
web.archive.org/web/20061206003428/http://www.cired.org/liturgy/apostles.html
Here is the version used by their counterpart, the Chaldean Catholics, which contain the Words of Instution:
kaldu.org/14_Reformed_ChaldeanMass/ReformedMissal_Eng.html
Even without the Words of Instution, it is obvious that that this ancient Liturgy intends to accomplish the Mystery of the Eucharist? Consider these words from the Assyrian recension:
**We too, my Lord, your feeble, unworthy, and miserable servants who are gathered in your name and stand before you at this hour, and have received by tradition the example which is from you, while rejoicing, glorifying, exalting, and commemorating, perform this great, fearful, holy, life-giving, and divine Mystery of the passion, death, burial, and resurrection of our Lord and Savior, Jesus Christ.
And may there come, O my Lord, your Holy Spirit, and may he rest upon this oblation of your servants. May he bless it and hallow it, and may it be for us, O my Lord, for the pardon of debts, the forgiveness of sins, the great hope of resurrection from the dead, and for new life in the kingdom of heaven with all who have been well-pleasing before you.**<<
How else can can we possibly “perform the mystery of the passion, death, burial and resurrection” of Christ except by the Eucharistic Sacrifice? How can bread and wine be “for the pardon of debts, the forgiveness of sins, etc”, unless they have become the Body and Blood of our Lord, God, and Savior Jesus Christ?