Regarding WB, answer the question I just asked TD in #67.
The epistles were written to those who had already believed and obeyed the command.
The Book of Acts serves as the historical account of the apostolic church and contains detailed examples of water baptism being administered. The epistles written by apostles do not contradict these recorded practices; rather, they confirm and expand upon them by explaining the doctrinal truths associated with baptism.
Although apostles' epistles do not frequently record direct commands to baptize as found in the historical narratives of Acts, they clearly demonstrate that water baptism was an established and essential part of the gospel preached. The Apostle Paul repeatedly referred to believers as having already been baptized, showing that baptism was a common and expected response to the gospel message.
This connection is especially evident in Paul's letter to the Ephesians. The church at Ephesus included believers who had personally experienced the events recorded in Acts 19:1–7, where Paul instructed disciples who had previously received only John's baptism to be baptized in the name of the Lord Jesus. In Ephesians 1:13, Paul reminded them that after hearing "the word of truth, the gospel of your salvation," they believed and were "sealed with that holy Spirit of promise." While this passage does not explicitly mention water baptism, it is consistent with and reflects the conversion experience recorded in Acts 19:1-7, where the Ephesian believers heard the gospel more fully, were baptized in the name of Jesus Christ, and received the Holy Ghost.
Likewise, Paul's discussion of baptism in 1 Corinthians 1:13–17 demonstrates that water baptism was being administered among the Corinthian believers as a normal part of apostolic ministry. While Paul emphasized that Christ sent him primarily to preach the gospel, he nevertheless acknowledged baptizing members of the church, confirming that baptism remained an integral component of the gospel response.
When studied together, Acts provides the historical record of apostolic practice, while Paul's epistles confirm and illuminate the doctrinal meaning of what was practiced. The historical accounts in Acts reveal how converts responded to the gospel, and the epistles explain the spiritual significance of those same experiences. Together they present a consistent and harmonious biblical witness concerning water baptism.
Scripture References:
Romans: Connects baptism to the Gospel narrative, teaching that believers are "buried with him through baptism into death" so that they can "walk in newness of life" (Rom. 6:3-4).
1 Corinthians: Refers to the Israelites being "baptized into Moses
in the cloud and
in the sea" (1 Cor. 10:2), and explicitly notes that believers are "baptized into one body" (1 Cor. 12:13).
Galatians: States that as many as were "baptized into Christ" have put on meaning "clothed yourselves with Christ" (Gal. 3:27).
Colossians: Teaches that believers are "buried with him in baptism" and "raised with him through faith" (Col. 2:12).
Titus: Describes salvation as coming through the "washing of rebirth and renewal by the Holy Spirit" (Titus 3:5).
Hebrews: Mentions drawing near to God with "our hearts sprinkled to cleanse us from a guilty conscience and our bodies washed with pure water" (Heb. 10:22).
1 Peter: Makes an explicit connection between the physical elements and spiritual reality, noting that "baptism that now saves you... is not the removal of dirt from the body but the pledge of a clear conscience toward God" (1 Pet. 3:21).
The New Testament letters build upon this practice by explaining the spiritual implications of being baptized into Christ's name:
Romans 6:3: Paul writes, "Do you not know that all of us who have been
baptized into Christ Jesus were baptized into his death?"
1 Corinthians 1:13: Paul rebukes divisions in the church by asking, "...Was Paul crucified for you? Or
were you baptized in the name of Paul?" This rhetorical question strongly implies that they were instead baptized exclusively in the name of Jesus.
Galatians 3:27: Paul emphasizes identity, stating, "For as many of you as were
baptized into Christ have put on Christ."
The Gospels (The Commission)
Matthew 28:19: In the Great Commission, Jesus instructs His disciples to go and make disciples of all nations, "baptizing them in the name of the Father and of the Son and of the Holy Spirit." That this command relates specifically to the singular "name of Jesus" is based on what Jesus’ apostles’ practiced in the Book of Acts.