Matthew 19:27 Has Peter forsaken everything to follow Jesus?
Fishing on the Sea of Galilee was a family business. They left all the equipment with the families they left.
And going on from there he saw two other brothers, James the son of Zebedee and John his brother, in the boat with Zebedee their father, mending their nets, and he called them. 22 Immediately they left the boat and their father and followed him.
(Matt 4:21–22, ESV)
And going on a little farther, he saw James the son of Zebedee and John his brother, who were in their boat mending the nets. 20 And immediately he called them, and they left their father Zebedee in the boat with the hired servants and followed him.
(Mark 1:19–20, ESV)
10 and so also were James and John, sons of Zebedee, who were partners [κοινωνοὶ] with Simon. And Jesus said to Simon, “Do not be afraid; from now on you will be catching men.” 11 And when they had brought their boats to land, they left everything and followed him.
(Luke 5:10–11, ESV)
The basic meaning of κοινωνοὶ means their fishing equipment was their common property. Perhaps that was how the disciples could get a boat to cross the Sea of Galilee.
When evening came, his disciples went down to the sea, 17 got into a boat, and started across the sea to Capernaum.
(John 6:16–17, ESV)
Peter with the Apostles had left their old life to follow Christ during his ministry until Jesus was arrested. Peter didn't know how to handle the arrest.
Then Simon Peter, having a sword, drew it and struck the high priest’s servant and cut off his right ear. (The servant’s name was Malchus.) 11 So Jesus said to Peter, “Put your sword into its sheath; shall I not drink the cup that the Father has given me?”
Peter did what Jesus predicted, in spit of determining not to do.
The servant girl at the door said to Peter, “You also are not one of this man’s disciples, are you?” He said, “I am not.” 18 Now the servants and officers had made a charcoal fire, because it was cold, and they were standing and warming themselves. Peter also was with them, standing and warming himself. ...
Now Simon Peter was standing and warming himself. So they said to him, “You also are not one of his disciples, are you?” He denied it and said, “I am not.” 26 One of the servants of the high priest, a relative of the man whose ear Peter had cut off, asked, “Did I not see you in the garden with him?” 27 Peter again denied it, and at once a rooster crowed.
(John 18:17-18,25–27, ESV)
Peter felt he was a failure as Jesus' disciple and returned to the previous life he knew.
Simon Peter, Thomas (called the Twin), Nathanael of Cana in Galilee, the sons of Zebedee, and two others of his disciples were together. 3 Simon Peter said to them, “I am going fishing.” They said to him, “We will go with you.” They went out and got into the boat, but that night they caught nothing.
(John 21:2–3, ESV)
The rest of John 21 is Jesus repeating the call and reinstation Jesus.
See *Two* miraculous catches of fish in John 21 and significance?