A sacred ordinance instituted by Jesus Christ in which a believer is immersed in (or washed with) water as an outward sign of inward spiritual reality — namely, death to the old self and resurrection to new life in Christ. Baptism is the public declaration of union with Christ in his death, burial, and resurrection (Romans 6:3–4). It is the rite of initiation into the covenant community of the church, commanded by Christ for all disciples (Matthew 28:19). In Scripture, baptism accompanies and seals saving faith — it does not produce salvation, but it is the expected, immediate response to it. There is also the baptism of the Holy Spirit, by which believers are united to Christ and to one another in one body.
BAP'TISM, n. The application of water to a person, as a sacrament or religious ceremony, by which he is initiated into the visible church of Christ. This is performed by sprinkling, pouring, or immersion. The baptism of adults is preceded by profession of faith; that of infants, by the faith of their parents or sponsors. The sacrament is a seal of the covenant of grace.
Secular culture uses "baptism by fire" and similar phrases to mean any initiatory trial, diluting the theological weight. Within the church, some traditions have reduced baptism to a meaningless ritual divorced from faith and repentance, while others inflate it into the instrument of regeneration itself (baptismal regeneration), confusing the sign with the thing signified. The cultural church often delays baptism indefinitely or treats it as optional, contrary to the NT pattern where baptism followed conversion immediately.
Matthew 28:19 — "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."
Romans 6:3–4 — "Do you not know that all of us who have been baptized into Christ Jesus were baptized into his death? We were buried therefore with him by baptism into death, in order that, just as Christ was raised from the dead by the glory of the Father, we too might walk in newness of life."
Acts 2:38 — "Repent and be baptized every one of you in the name of Jesus Christ for the forgiveness of your sins, and you will receive the gift of the Holy Spirit."
Galatians 3:27 — "For as many of you as were baptized into Christ have put on Christ."
G908 — βάπτισμα (baptisma): "baptism, immersion" — the act and ordinance itself
G907 — βαπτίζω (baptizō): "to immerse, to baptize" — the verb commanded by Christ
G4151 — πνεῦμα (pneuma): "spirit, breath" — the Holy Spirit who baptizes believers into one body (1 Cor. 12:13)
"Baptism is the believer's first act of public obedience — a visible sermon preached to the watching world that you have died with Christ and been raised with him."
"The Ethiopian eunuch did not delay: 'See, here is water! What prevents me from being baptized?' — he was baptized on the spot (Acts 8:36–38)."
"Christian baptism is not self-improvement or a religious upgrade — it is a burial and a resurrection, a declaration that your old life is dead."