Mark 16:9
Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven devils.
Cross-reference
Mark 15:40 lists Mary Magdalene among the women at the cross, confirming her identity as the first resurrection witness.
Mark 15:47 notes Mary Magdalene saw Jesus' burial, so she was present at the tomb before His resurrection appearance.
Luke 8:2 confirms Mary Magdalene had seven demons cast out, the same detail given here.
Luke 24:10 also names Mary Magdalene as a resurrection witness, paralleling this account.
John 20:14-18 describes the same event: Jesus appears to Mary Magdalene at the tomb.
Matthew 28:9 describes the same resurrection appearance to the women, including Mary Magdalene, paralleling Mark's account.
John 20:19 records Jesus appearing to the disciples later that same first day, continuing the resurrection appearances after Mary Magdalene in Mark 16:9.
Matthew 27:56 lists Mary Magdalene among women at the crucifixion, providing background for her being the first resurrection witness.
John 19:25 places Mary Magdalene at the crucifixion, reinforcing her faithful presence as background for her being the first to see the risen Jesus.