Mark 16:5
And entering into the sepulchre, they saw a young man sitting on the right side, clothed in a long white garment; and they were affrighted.
Cross-reference
Mark 16:8 describes the women fleeing trembling and silent — the direct aftermath of the encounter with the young man.
In Mark 9:6, Peter's terror at the transfiguration parallels the women's alarm — both fear a divine manifestation.
Matthew 28:1 introduces the same women going to the tomb at dawn — the setting for the encounter Mark 16:5 describes inside.
Matthew 28:3 describes the same angel with lightning-like appearance and snow-white clothing — a parallel account of the resurrection angel.
In Luke 1:12, Zechariah reacts with fear at an angelic appearance — paralleling the women's alarm at the young man in the tomb.
In Luke 1:30, the angel tells Mary 'Do not be afraid' — mirroring the young man's 'Do not be alarmed' to the women.
Luke 24:3 reports that the women did not find Jesus' body — the same empty tomb context as Mark 16:5 where they see a young man.
Luke 24:4 describes two men in dazzling clothes appearing — similar to the young man in Mark 16:5, though Mark has one angelic figure.
Luke 24:5 gives the parallel scene: two angels, the women's fear, and the question 'why seek the living among the dead?'
John 20:12 also mentions two angels in white at the tomb — a parallel account of the empty tomb.
John 20:8 describes Peter and John entering the tomb later — a different visit than the women in Mark 16:5, but confirms the empty tomb.
In Acts 1:10, two men in white robes appear at the ascension — a similar angelic manifestation in white clothing.