The churches in first century, the epsitlereceiver from the Apostle of John is about the churchesthat experience some challenges internallyand eksternally. The challenges that they experienced are very difficult because those can make some part of congregations must be lost their lives for maintaining their faith to Jesus Christ.In this situation The Apostle of John write the book of revelation. Because of the book of revelation also has kind of literature letter, then the Apostle of John open his book by saying trinitarian greeting. Revelation 1: 5 specifically is the greeting from Jesus Christ The faithful witness. This greetingis relevant for the Churchesin first century. The method that is used on this epistle is by doing biblical theologyresearch with hermeneutic and assessment bible approach for understanding the meaning of texts in the beginning of writer's context. By understanding that, will be seen the appellation for Jesus from the greeting Ἰησοῦ χριστοῦ, ὁ μάρτυς ὁ πιστόςon the Revelation 1: 5, it has relevance with churches in first century.