Missionary service in the Bible refers to the practice of spreading the gospel and the teachings of Jesus Christ to all nations and people, a mandate rooted in the Great Commission found in Matthew 28:19-20. In this passage, Jesus commands His disciples to "go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit." This directive emphasizes not only the importance of evangelism but also the establishment of communities of believers through teaching and nurturing in the faith.The concept of missionary service is exemplified in the early church, particularly through the apostolic journeys of Paul, as described in the Book of Acts. Paul’s missionary journeys (Acts 13-21) involved traveling to different regions, preaching in synagogues, and establishing churches among both Jews and Gentiles. The role of missionary service is further highlighted in Romans 10:14-15, where Paul underscores the necessity of preaching for faith to arise, stating, "How then will they call on him in whom they have not believed? And how are they to believe in him of whom they have never heard? And how are they to hear without someone preaching?" Thus, missionary service in the biblical context is integral to the spread of Christianity and fulfilling God’s plan for salvation across cultural and geographical boundaries.