At the start of his ministry, Jesus was baptized by John the Baptist. Critical scholars broadly agree that the baptism of Jesus is one of the most authentic, or historically likely, events in the life of the historical Jesus. Christian baptism has its origin in the baptism of Jesus, in both a direct and historical sense. Many of the earliest followers of Jesus were people who, like him, were baptized in the Jordan by John the Baptist.

Answer this question: who was the first person baptized in the bible? Let's think fast. Stream of consciousness:
The important part for answering this question is: Christian baptism has its origin in the baptism of Jesus, in both a direct and historical sense. So the final answer is Jesus.