Christian Fellowship "By Invitation Only"
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Introduction
The church is frequently described as an open community, but such language can obscure the covenantal nature of Christian fellowship. The gospel is proclaimed to the world, Christ calls people to discipleship, and the church is commissioned to make disciples. Yet the proclamation of the gospel should not be confused with unrestricted participation in Christian fellowship. From its earliest expressions, the church understood itself not merely as an assembly of individuals who shared religious convictions but as a distinct people whose common life was ordered by the teaching of Jesus and the apostles. The New Testament's language of fellowship, incorporation, discipleship, and baptism indicates that entrance into the Christian community involved more than an individual profession of faith. It involved participation in a people.
By Invitation Only
In this sense, Christian fellowship may be described as "by invitation only." The phrase should not be interpreted as a defense of ecclesial elitism or exclusion. Rather, it identifies the covenantal character of the community formed by those who belong to Christ. Christian fellowship is not an unrestricted association in which participation is assumed merely because a person is physically present or professes a general interest in Christianity. Fellowship belongs to a particular people whose identity is established by their relationship to Christ and expressed through the practices of the covenant community.
This distinction becomes clearer when we consider the New Testament's vocabulary of fellowship. The Greek term koinōnia (G2842) denotes fellowship, participation, communion, or sharing. Its semantic range extends beyond casual association. It can describe participation in something held in common and fellowship between persons who share a particular relationship. When the New Testament describes Christian life in terms of koinōnia, it presents believers as participants in a common reality rather than merely individuals who happen to gather in the same place.
The New Testament's concept of the church carries an important communal dimension. The Greek term ekklēsia (G1577), commonly translated as "church" or "assembly," refers to a gathered community. The church is not simply a building, a religious event, or an abstract collection of people who affirm Christian beliefs. It is a gathered people whose identity is constituted by their relationship to Jesus and to one another. The question of who belongs to this community is inseparable from the question of what it means to participate in the life of Christ's body.
The language of covenant becomes particularly explicit at the Last Supper. Jesus declares, "This is my blood of the covenant, which is poured out for many for the forgiveness of sins" (Matt. 26:28). Luke records the same theological reality in the words, "This cup is the new covenant in my blood, which is poured out for you" (Luke 22:20b). The phrase "new covenant" (Greek: kainē diathēkē, G2637 / G1242) places the church's communal identity within God's redemptive covenantal action. Those who belong to Christ are not merely individuals who have made private religious decisions; they are incorporated into a people whose identity is grounded in Christ's death and resurrection and whose fellowship is ordered by the covenant he established.
The account of Pentecost in Acts 2 provides one of the clearest examples of the movement from proclamation to participation. Peter proclaims Jesus' death and resurrection, calls his hearers to repentance, and instructs them about baptism. His hearers respond, and Luke records: "Those who accepted his message were baptized, and about three thousand were added to their number that day" (Acts 2:41). The verb translated "were added" is prostithemi (G4369), conveying the idea of being added or joined to a group. Luke presents conversion not merely as an inward spiritual experience but as incorporation into an identifiable community.
Luke immediately describes the consequences of this incorporation: "They devoted themselves to the apostles' teaching and to fellowship, to the breaking of bread and to prayer" (Acts 2:42). The term koinōnia appears here in the description of the believers' common life. Christian conversion involves both personal faith and communal participation. The believer does not simply enter into an isolated relationship with God but becomes part of a people whose life is ordered by apostolic teaching, fellowship, worship, and prayer.
Church as the Body of Christ
Paul develops this communal understanding through his metaphor of the church as Christ's body. He tells the Corinthians, "Now you are the body of Christ, and each one of you is a part of it" (1 Cor. 12:27). The language of the body establishes more than an illustration of Christian unity. It provides a theological basis for mutual obligation. Believers possess different gifts, functions, and roles, yet they belong to one body because they have been incorporated into Christ. Earlier, Paul writes, "For we were all baptized by one Spirit to form one body—whether Jews or Gentiles, slave or free—and we were all given the one Spirit to drink" (1 Cor. 12:13). Baptism functions as incorporation into the one body.
This incorporation is significant both ethically and ecclesially. Because believers belong to one body, they are responsible for one another. Paul writes that "God has put the body together" so that its members might care for one another, and he concludes, "If one part suffers, every part suffers with it; if one part is honored, every part rejoices with it" (1 Cor. 12:24–26). Christian fellowship creates obligations because participation in Christ necessarily entails participation in the life of his people.
Participation in the Lord's Supper
Paul's teaching in 1 Corinthians 10 provides a particularly important connection between participation in the Lord's Supper and ecclesial identity. Paul asks: "Is not the cup of thanksgiving for which we give thanks a participation in the blood of Christ? And is not the bread that we break a participation in the body of Christ?" (1 Cor. 10:16). The word translated "participation" is koinōnia (G2842). Paul does not describe the bread and cup merely as individual religious experiences. He describes them as participation in Christ himself.
He immediately draws the ecclesiological implication: "Because there is one loaf, we, who are many, are one body, for we all share the one loaf" (1 Cor. 10:17). The Lord's Supper is inseparable from the identity and conduct of the Christian community that celebrates it. Paul makes this point even more forcefully in 1 Corinthians 11, where he warns the Corinthians concerning their manner of participation in the Lord's Supper. He writes, "So then, whoever eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of sinning against the body and blood of the Lord" (1 Cor. 11:27). Paul subsequently commands believers to examine themselves before eating and drinking (1 Cor. 11:28). Participation in the Lord's Supper expresses both communion with Christ and membership in his body. It is not merely an individual act of devotion but a practice of the gathered covenant community.
Fellowship, Discernment, and Conduct
The Didachē (G1322, "Teaching") demonstrates that early Christian fellowship included both welcome and discernment. Its instructions concerning traveling apostles, prophets, teachers, and other visitors reveal a community that practiced hospitality while also evaluating claims to Christian authority. The community was not instructed to reject outsiders indiscriminately, but it was also not expected to accept every claimant without examination.
This discernment was based upon both teaching and conduct. The Didachē distinguishes legitimate Christian ministry from individuals who exploit Christian hospitality for personal advantage. Jesus' ministry demonstrates hospitality toward sinners, outsiders, and those society marginalizes. Yet his hospitality consistently includes a summons to repentance and discipleship. Mark records Jesus' proclamation: "The kingdom of God has come near. Repent and believe the good news!" (Mark 1:15).
The same pattern appears in the Great Commission. Jesus commands his followers to "go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit" and "teaching them to obey everything I have commanded you" (Matt. 28:19–20). The commission contains interconnected dimensions: proclamation, discipleship, baptism, and obedience. The Greek term mathēteuō (G3100), translated as "make disciples," conveys the idea of making or becoming a disciple. Christian mission aims beyond the initial response. The goal is incorporation into a life of ongoing formation under the teaching of Jesus. Baptism identifies the disciple with the Christian community, while instruction in Jesus' commands establishes the pattern by which that community lives.
Covenant Fellowship and Mutual Obligation
The covenantal implications of Christian fellowship extend beyond baptism and participation in the Lord's Supper. The New Testament repeatedly employs the language of mutual obligation to describe the Christian life. Jesus commands his disciples: "A new command I give you: Love one another. As I have loved you, so you must love one another" (John 13:34). Paul commands believers to "Carry each other's burdens, and in this way you will fulfill the law of Christ" (Gal. 6:2). He also instructs the Thessalonians to "encourage one another and build each other up" (1 Thess. 5:11). Such commands presuppose an identifiable community whose members bear responsibilities toward one another. The church is more than a gathering of people who share a common interest in Christianity. It is a people bound together by their common relationship to Christ.
Bibliography
Monographs
Kariatlis, Philip. Church as Communion: The Gift and Goal of Koinonia. Adelaide, Australia: ATF Press, 2011.
Niederwimmer, Kurt. The Didache: A Commentary. Translated by Linda M. Maloney. Edited by Harold W. Attridge. Hermeneia. Minneapolis: Fortress, 1998.
Journal Articles
Alesso, Marta. "Bautismo y eucaristía antes del cristianismo: raíces judías de la Didaché."↗ Circe de clásicos y modernos 13, no. 1 (2009): 11–27.
Strout, Shawn. "Jesus' Table Fellowship, Baptism, and the Eucharist."↗ Anglican Theological Review 98, no. 3 (2016): 479–94.
