Biblical Baptism must have…
The right candidate: a penitent believer (Acts 2:38; 8:36).
The right purpose: salvation, forgiveness (Mark 16:16).
The right method: immersion (Acts 8:38; Romans 6:1-4).
The right Authority: into the name of Father, the son, the Holy spirit (Matthew 28:19).
Some have the right authority and purpose, but miss the candidate and method.
Others have the right method, authority, and candidate, but miss the purpose.
Still others may have the right candidate, method, and purpose, but miss the authority—preaching a different Jesus.