Reference

John 21
Jesus and Peter

The Resurrected Christ meets the Disciples at the Sea of Galilee, eats breakfast with them, and then speaks to Peter asking 3 times, "Do you love Me?"

This conversation cancels out the 3 times Peter denied Jesus, and restores him as a faithful Disciple.  It changes Peter's life and allows him to be the leader of the Disciples throughout the book of Acts.