In the book of Acts we see that those who accepted the gospel were all baptized. They believed in Jesus and were baptized as an expression of that faith.
Occasionally someone will ask, “Do I have to be baptized?” If, upon reading the gospels, we hear Jesus say, “Go and make disciples of all nations, baptizing them in the name of the Father, and of the Son and of the Holy Spirit, and teaching them to obey everything I have commanded you” (Matthew 28:19) — as a Christian who wishes to follow Christ, we should want to do that.
The apostle Peter said to the conscience-stricken believers on the day of Pentecost, “Repent and be baptized, every one of you, in the name of Jesus Christ for the forgiveness of your sins” (Acts 2:38).
In recounting (for the third time) his conversion experience, Paul quoted his spiritual guide, Ananias: “And now what are you waiting for? Get up, be baptized and wash your sins away, calling on His name” (Acts 22:16).
Jesus said to do it. Peter said to do it. Paul said, “I did it.” As believers, we should think seriously about doing it, too.