God describes two offices in His Church to which a man might be chosen: bishop (1Ti 3:1) and deacon. (1Ti 3:13) Each role serves the congregation as a representative, acting on its behalf.
Deacons oversee temporal concerns (Ac 6:2), and bishops provide spiritual care. (1Ti 3:5) Each role requires a solid, godly character, known by the saints and verified by experience over time in close community. (1Ti 3:2, 10)
Conspicuously absent are the roles of pastor and elder; neither term describes a church role or office. A pastor is spiritually gifted in caring for others, shepherding and nurturing saints to spiritual maturity. (Ep 4:11-12) An elder is simply an older man. (1Ti 5:1-2) Neither of these terms identifies a formal leadership role to which one might be chosen; no moral qualifications are ever mentioned for either one.
A unified brotherhood is the only valid leadership model in Christ’s church; any other is a corruption of the biblical pattern. Bishops and deacons are first and foremost brothers (Mt 23:8), acknowledged by the brotherhood as equipped to represent the congregation in specific ways.
Bishops, in particular, are typically chosen from among the elder brothers (Tit 1:5), being recognized by the brothers as God’s representatives of the congregation to those outside it. (1Ti 3:7) No specific duties or responsibilities are ever detailed for bishops; they evidently have no specific function to fulfill within the church itself, apart from their roles as older, more influential and respected brothers. (1Pe 5:1-3)