As He was walking along the Sea of Galilee, He saw two brothers, Simon, who was called Peter, and his brother Andrew. They were casting a net into the sea, since they were fishermen.
References for Matthew 4:18
"Follow Me," He told them, "and I will make you fish for people!"
References for Matthew 4:19
Immediately they left their nets and followed Him.
Going on from there, He saw two other brothers, James the son of Zebedee, and his brother John. They were in a boat with Zebedee their father, mending their nets, and He called them.
Immediately they left the boat and their father and followed Him.