The other disciple was likely John, "the one whom Jesus loved" and the author of this Gospel (see 13:23). He and Peter confirmed Mary's testimony by checking the tomb themselves. John got there first, but Peter went in first.
The other disciple was likely John, "the one whom Jesus loved" and the author of this Gospel (see 13:23). He and Peter confirmed Mary's testimony by checking the tomb themselves. John got there first, but Peter went in first.