John did baptize
Mark 1:4
1:4 John did baptize. Some have suggested that John’s baptism was a sort of “proselyte baptism.” However, there is no such thing as proselyte baptism mentioned in the Old Testament, the writings of Josephus, Philo, or any other literature of the apostolic era or earlier. John’s baptism was true Christian baptism. See notes on John 1:7,23-34; Acts 2:41; 19:1-5 as well as on the parallel passage in Matthew 3:1-11. Note that Jesus’ disciples, who already had been baptized by John, were never re-baptized when they left John to follow Jesus.