Both of them were running together, but the other disciple outran Peter and reached the tomb first. (John 20:4 ESV)
Peter and John heard that the tomb of Jesus was empty, but they had to see it for themselves. So they ran all way there. John outran Peter, but Peter went in first.
They saw the empty tomb. Jesus was not there. They believed him to be alive, but they didn’t yet understand the significance of the event. It was unprecedented.
Today, it is still unprecedented. People don’t just come out of tombs. When we run to Jesus we aren’t running to the grave. We’re running to the grave robber. We’re running to life.