What is baptism in the Bible?

Baptism is one of the few practices virtually all Christians share, yet they disagree profoundly about what it means and how it should be performed. Should babies be baptised or only believers? Is immersion required? Does baptism save, or does it symbolise a salvation already received?

This guide examines what the Bible actually says about baptism, traces its development from Jewish ritual washing through John the Baptist to the early church, and explains the major Christian positions.

Baptism did not begin with Jesus. Jewish law required ritual immersion (mikveh) for purification. Proselytes converting to Judaism were baptised. John the Baptist transformed this practice into a public act of repentance in preparation for the coming Messiah.

John’s baptism was unique in several ways: it was performed once, not repeatedly; it was public and communal; and it was tied to moral transformation, not merely ritual purity. When Jesus submitted to John’s baptism, he identified himself with sinful humanity and inaugurated his public ministry.

After Pentecost, baptism became the entry rite for the Christian community. Peter told the crowd, "Repent, and be baptized every one of you in the name of Jesus Christ for the remission of sins." Acts records baptisms of individuals, households, an Ethiopian eunuch, and a Roman jailer — always in response to the gospel message.

Paul developed the theology of baptism further. In Romans 6, he describes baptism as dying and rising with Christ: "We are buried with him by baptism into death: that like as Christ was raised up from the dead, even so we also should walk in newness of life." Baptism is not merely a symbol; it participates in the reality it represents.

Baptists and most evangelicals practise believer’s baptism by immersion, arguing that the New Testament shows only conscious believers being baptised. Catholics, Orthodox, Lutherans, and Reformed Christians practise infant baptism, arguing that household baptisms in Acts likely included children and that baptism parallels circumcision as the covenant sign.

The mode matters too. Immersion reflects the death-and-resurrection symbolism of Romans 6. Pouring reflects the outpouring of the Spirit at Pentecost. Sprinkling reflects Old Testament purification rites. Each tradition appeals to Scripture and has practised its form for centuries.