Table service, as a charitable dimension, has traditionally been thought of as the raison d être of the diaconal ministry. His service, however, is not isolated in the assistance work. The proclamation of the Gospel, preaching and catechesis are elements specific of the diaconal ministry. In this sense, this work aims to reflect on the munus docendi entrusted to the deacon, taking as a case study the mission of the Seven Hellenists and their epigones, highlighting its importance in the process of expansion of Christianity from the formulation of a new missionary mentality. The Seven had a characteristically urban mission, which moved Christianity from Palestine to the Greco-Roman world. His mission between the Hellenists and the Gentiles was the bridge between the Gospel of Jesus and the theology of Paul. From an early age, they abandoned their Jewish traits and rituals and began to admit new members based on new criteria, more attuned to the Gentile environment.