Chaldean Syrian Church in the context of "Malabar region"

The Words of Institution, also called the Words of Consecration, are words echoing those of Jesus himself at his Last Supper that, when consecrating bread and wine, Christian eucharistic liturgies include in a narrative of that event. Eucharistic scholars sometimes refer to them simply as the verba (Latin for "words").

Almost all existing ancient Christian churches explicitly include the Words of Institution in their eucharistic celebrations and consider them necessary for the validity of the sacrament. This is the practice of the Catholic Church's Latin liturgical rites and Eastern Catholic liturgies, the Eastern Orthodox Church, and all the Oriental Orthodox Churches, including the Armenian, the Coptic, the Ethiopian and the Malankara, as well as the Anglican Communion, Lutheran churches, Methodist churches, and Reformed churches. The only ancient eucharistic ritual still in use that does not explicitly contain the Words of Institution is the Holy Qurbana of Addai and Mari, used for part of the year by the Church of the East denominations, namely Assyrian Church of the East, Ancient Church of the East, and the Chaldean Syrian Church, due to their tradition of using the Holy Leaven. The Chaldean Catholic Church and the Syro-Malabar Church, two of the Eastern Catholic Churches, use the same Anaphora, but insert in it the Words of Institution. However, groups authorized by the Catholic Church to review the Qurbana recognized the validity of this eucharistic celebration in its original form, without explicit mention of the Words of Institution, saying that "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."

The Saint Thomas Christians, also called Syrian Christians of India, Marthoma Suriyani Nasrani, Malankara Nasrani, or Nasrani Mappila, are an ethno-religious community of Indian Christians in the state of Kerala (Malabar region), who, for the most part, employ the Eastern and Western liturgical rites of Syriac Christianity. They trace their origins to the evangelistic activity of Thomas the Apostle in the 1st century. The Saint Thomas Christians had been historically a part of the hierarchy of the Church of the East but are now divided into several different Eastern Catholic, Oriental Orthodox, Protestant, and independent bodies, each with their own liturgies and traditions. They are based in Kerala and they speak Malayalam. Nasrani or Nazarene is a Syriac term for Christians, who were among the first converts to Christianity in the Near East.

Historically, this community was organised as the Province of India of the Church of the East, by Patriarch Timothy I (780–823 AD) in the eighth century, it was served by bishops and a local dynastic archdeacon. In the 14th century, the Church of the East declined in the Near East, due to persecution from Tamerlane. Portuguese colonial overtures to bring St Thomas Christians into the Latin Church of the Catholic Church, administered by their Padroado system in the 16th century, led to the first of several rifts (schisms) in the community. The attempts of the Portuguese culminated in the Synod of Diamper, formally subjugating them to the Portuguese Padroado and imposing upon them the Roman Rite of worship. The Portuguese oppression provoked a violent resistance among the Thomasine Christians, that took expression in the Coonan Cross Oath protest in 1653. This led to the permanent schism among the Thomas' Christians of India, leading to the formation of Puthankoor or Puthankūttukār ("New allegiance" ) and Paḻayakūṟ or Pazhayakūr ("Old allegiance") factions. The Paḻayakūṟ comprise the present day Syro-Malabar Church and Chaldean Syrian Church which continue to employ the original East Syriac Rite. The Puthankoottukar, who continued to resist the Catholic missionaries, organized themselves as the independent Malankara Church and entered into a new communion with the Syriac Orthodox Church of Antioch, inheriting from them the West Syriac Rite, replacing the old East Syriac Rite liturgy.

The Liturgy of Addai and Mari (or the Holy Qurbana of Mar Addai and Mar Mari) is the Eucharistic liturgy belonging to the East Syriac Rite and was historically used in the Church of the East of the Sasanian (Persian) Empire. This liturgy is traditionally attributed to Saint Addai (disciple of Saint Thomas the Apostle) and Saint Mari (a disciple of Saint Addai). It is currently in regular use in the Assyrian Church of the East (including its archdiocese the Chaldean Syrian Church of India), the Ancient Church of the East, the Syro-Malabar Catholic Church of India, and the Chaldean Catholic Church. The latter two are Eastern Catholic churches in full communion with the Holy See of Rome.

The Holy Qurbana (Syriac: ܩܘܼܪܒܵܢܵܐ ܩܲܕܝܼܫܵܐ, Qurbānā Qaddišā in Eastern Syriac or Qurbānā Qandišā in the Indian variant of Eastern Syriac, the "Holy Offering" or "Holy Sacrifice" in English), refers to the Eucharistic liturgy as celebrated in Syriac Christianity and the liturgical books containing the rubrics for its celebration. Churches that celebrate this liturgy include various descendants of the Church of the East. East Syriac Christianity consists of an Edessan liturgical rite called the East Syriac Rite (also known as the Edessan Rite, Assyrian Rite, Babylonian Rite, Chaldean Rite or Persian Rite). The major anaphora of the East Syriac tradition is the Holy Qurbana of Saints Addai and Mari; Addai being a disciple of Thomas the Apostle and Mari being Addai's disciple. These churches are primarily based in the Middle East and India, with diasporic communities settled in the western world.

The East Syriac Rite is employed by the Assyrian Church of the East based in Iraq (including its archdiocese the Chaldean Syrian Church of India) and the Ancient Church of the East based in Iraq. Additionally, the rite is employed by the Syro-Malabar Church based in India and the Chaldean Catholic Church based in Iraq, both of which are sui iuris Eastern Catholic Churches.

Mar Awgin Kuriakose (born 21 May 1974) is the Metropolitan of the Chaldean Syrian Church (Assyrian Church of the East) in India, overseeing the Archdiocese of India and the Southern Gulf Countries. He was installed as Metropolitan on 8 January 2023, succeeding Mar Aprem Mooken, and had previously served as Patriarchal Administrator from September 2021.