The Fourth Gospel reveals that early in Jesus' ministry, his disciples performed baptisms roughly like those of John the Baptist (John 3:22; 4:1-2). Jesus never personally baptized anyone, and it seems that the disciples only briefly imitated John's baptism.`' Thus, the baptism that Jesus inaugurates is distinct from John's. John's baptism belonged
to the old covenant. It signified repentance and cleansing from sin. By receiving it, Jewish believers affirmed their loyalty to the old covenant. The baptism that Jesus institutes differs also from his disciples' baptism. Both baptisms show
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Why weren't the disciples given Christian baptism afterwards then?
John Calvin didn't differentiate between John's baptism and the baptisms performed in Acts (See Institute')