John the Baptist was standing with Andrew and John, two of his disciples one day. He saw Jesus and pointing Him out to them, he said, “Behold the Lamb of God.” Since John was preparing the way for Him, these two disciples left him and followed Jesus.
Andrew brought his brother, Simon (who would later be called Peter) to Jesus. The next day, Jesus found Philip and Philip brought Nathanael (Bartholomew) to Him. He then had five disciples who would work with Him during His ministry.